Examples with solutions for Solving Equations by using Addition/ Subtraction: Equations with variables on both sides

Exercise #1

Solve for X:

2x+4=3x5 2x + 4 = 3x - 5

Step-by-Step Solution

To solve for x x , first, we need to get all terms involving x x on one side of the equation and constant terms on the other. Start with the original equation:

2x+4=3x5 2x + 4 = 3x - 5

Subtract 2x 2x from both sides to isolate the term involving x x on one side:

4=x5 4 = x - 5

Next, add 5 to both sides to isolate x x :

9=x 9 = x

Thus, the value of x x is 9 9 .

Answer

9 9

Exercise #2

Solve for X:

5x+2=4x+10 5x+2=4x+10

Step-by-Step Solution

To solve the equation 5x+2=4x+10 5x + 2 = 4x + 10 , we can simplify and solve for x x by following these steps:

  • First, let's get all terms involving x x on one side and the constant terms on the other. We do this by subtracting 4x 4x from both sides:

    5x+24x=4x+104x 5x + 2 - 4x = 4x + 10 - 4x

    This simplifies to:

    x+2=10 x + 2 = 10

  • Next, we need to isolate x x by subtracting 2 from both sides:

    x+22=102 x + 2 - 2 = 10 - 2

    Which simplifies to:

    x=8 x = 8

Thus, the solution for x x is 8 8 .

Answer

8 8

Exercise #3

Solve for X:

6x3=7x+5 6x-3=7x+5

Step-by-Step Solution

The given equation is: 6x3=7x+5 6x-3=7x+5

Our goal is to solve for x x . To achieve this, we'll first get all the terms containing x x on one side of the equation and constants on the other side.

Step 1: Subtract 6x 6x from both sides to get all x x terms on one side:

  • 6x36x=7x+56x 6x - 3 - 6x = 7x + 5 - 6x

This simplifies to:

  • 3=x+5 -3 = x + 5

Step 2: Next, subtract 5 5 from both sides to isolate x x :

  • 35=x+55 -3 - 5 = x + 5 - 5

This simplifies to:

  • 8=x -8 = x

Therefore, the solution for x x is 8 -8 .

Answer

8 -8

Exercise #4

Solve for X:

3x+5=2x+20 3x+5=2x+20

Step-by-Step Solution

To solve the equation 3x+5=2x+20 3x + 5 = 2x + 20 , we need to find the value of x x that satisfies this equation. Here are the detailed steps:

  • Step 1: Eliminate the variable from one side.
    We want to get all terms involving x x on one side and constant terms on the other side. First, subtract 2x 2x from both sides of the equation to eliminate x x from the right side.

    3x+52x=2x+202x 3x + 5 - 2x = 2x + 20 - 2x

    This simplifies to:

    x+5=20 x + 5 = 20

  • Step 2: Simplify the equation.
    Now, we need to isolate x x by removing the constant term from the left side. Subtract 5 from both sides:

    x+55=205 x + 5 - 5 = 20 - 5

    This simplifies to:

    x=15 x = 15

  • Step 3: Verify the solution.
    Substitute x=15 x = 15 back into the original equation to check if it holds true:

    3(15)+5=2(15)+20 3(15) + 5 = 2(15) + 20

    This results in:

    45+5=30+20 45 + 5 = 30 + 20

    50=50 50 = 50

    Since both sides of the equation are equal,x=15 x = 15 is indeed the correct solution.

Therefore, the solution to the equation 3x+5=2x+20 3x + 5 = 2x + 20 is x=15 x = 15 .

Answer

15 15

Exercise #5

Solve for X:

4x+4=5x+2 4x+4=5x+2

Step-by-Step Solution

We start with the equation:
4x+4=5x+2 4x + 4 = 5x + 2

Our goal is to solve for x x . To do this, we aim to collect all terms containing x x on one side of the equation and constant terms on the other side. First, subtract 4x 4x from both sides of the equation to eliminate the x x term on the left side:

4x+44x=5x+24x 4x + 4 - 4x = 5x + 2 - 4x

This simplifies the equation to:

4=x+2 4 = x + 2

Next, subtract 2 2 from both sides to isolate the variable x x on the right side:

42=x+22 4 - 2 = x + 2 - 2

This gives us:

2=x 2 = x

Thus, the solution to the equation is x=2 x = 2 .

Answer

2 2

Exercise #6

Solve for X:

8x1=7x+5 8x - 1 = 7x + 5

Step-by-Step Solution

Start by moving the 7x 7x term to the left side by subtracting 7x 7x from both sides:
8x7x1=7x+57x8x - 7x - 1 = 7x + 5 - 7x
This simplifies to:
x1=5x - 1 = 5

Next, add1 1 to both sides to isolate x x :
x1+1=5+1x - 1 + 1 = 5 + 1
Simplifying this, we get:
x=6x = 6.

Answer

4 -4

Exercise #7

Solve for X:

9x3=10x+1 9x-3=10x+1

Step-by-Step Solution

To solve the equation 9x3=10x+1 9x - 3 = 10x + 1 , we need to get all terms with x x on one side and constant terms on the other side. Here's how we do it step-by-step:

  • First, subtract 9x 9x from both sides of the equation to start getting x x terms on one side. This gives us: 3=x+1 -3 = x + 1

  • Next, subtract 1 from both sides to isolate x x . We get: 31=x -3 - 1 = x

  • Simplifying the left side, we find: x=4 x = -4

Therefore, the solution is x=4 x = -4 .

Answer

4 -4

Exercise #8

Solve for X:

x+3=5+2x x+3=-5+2x

Video Solution

Step-by-Step Solution

To solve the equation x+3=5+2x x + 3 = -5 + 2x , we will proceed with these steps:

  • Step 1: Simplify and rearrange the terms.
  • Step 2: Isolate the variable x x .
  • Step 3: Solve for x x .

Let's go through each of these steps.

Step 1: Simplify the equation by moving all terms involving x x to one side and constant terms to the other. Subtract x x from both sides:
x+3x=5+2xx x + 3 - x = -5 + 2x - x
This simplifies to:
3=5+x 3 = -5 + x

Step 2: Add 5 to both sides to isolate x x :
3+5=x 3 + 5 = x

Step 3: Simplify the result:
8=x 8 = x

Therefore, the solution to the equation is x=8 x = 8 .

Answer

8 8

Exercise #9

Solve for X:

x+34x=5x+618x x+3-4x=5x+6-1-8x

Video Solution

Step-by-Step Solution

To solve the given problem, we'll proceed as follows:

  • Step 1: Simplify both sides of the equation.
  • Step 2: Check if x x can be isolated or analyze if the equation results in contradictions.

Now, let's work through each step:
Step 1: Simplify the left side: x+34x=(1x4x)+3=3x+3 x + 3 - 4x = (1x - 4x) + 3 = -3x + 3 .
Step 2: Simplify the right side: 5x+618x=(5x8x)+(61)=3x+5 5x + 6 - 1 - 8x = (5x - 8x) + (6 - 1) = -3x + 5 .

The simplified equation becomes:

3x+3=3x+5-3x + 3 = -3x + 5

To solve for x x , we attempt to isolate x x . If we add 3x 3x to both sides to eliminate the 3x-3x terms, we get:

3=53 = 5

This results in a contradiction, as 3 is not equal to 5, indicating that there is no value of x x that can satisfy this equation.

Therefore, the solution to the problem is no solution as indicated by the contradiction.

Answer

No solution

Exercise #10

Solve for X:

67x=5x+8 6-7x=-5x+8

Video Solution

Step-by-Step Solution

To solve the equation 67x=5x+8 6 - 7x = -5x + 8 , we will follow these steps:

  • Step 1: Move all terms involving x x to one side of the equation by adding 5x 5x to both sides.
  • Step 2: Simplify both sides of the equation.
  • Step 3: Solve for x x .

Now, let's work through each step:

Step 1: Add 5x 5x to both sides to move the x x -term to the left side:

67x+5x=8 6 - 7x + 5x = 8

Step 2: Simplify the equation by combining the x x -terms on the left side:

62x=8 6 - 2x = 8

Step 3: To isolate 2x -2x on the left, subtract 6 6 from both sides:

2x=86 -2x = 8 - 6

Simplify the right side:

2x=2 -2x = 2

Finally, divide both sides by 2-2 to solve for x x :

x=22 x = \frac{2}{-2}

x=1 x = -1

Therefore, the solution to the problem is x=1 x = -1 .

Answer

1 -1

Exercise #11

Solve for X:

4x7=x+5 4x - 7 = x + 5

Video Solution

Step-by-Step Solution

To solve forx x , first, get all terms involving x x on one side and constants on the other. Start from:

4x7=x+5 4x - 7 = x + 5

Subtract x x from both sides to simplify:

3x7=5 3x - 7 = 5

Add 7 to both sides to isolate the terms withx x :

3x=12 3x = 12

Divide each side by 3 to solve forx x :

x=4 x = 4

Thus, x x is 4 4 .

Answer

4 4

Exercise #12

Solve for X:

12x+1=12 \frac{1}{2}x+1=\frac{1}{2}

Video Solution

Step-by-Step Solution

To solve the equation 12x+1=12\frac{1}{2}x + 1 = \frac{1}{2}, follow these steps:

  • Step 1: Subtract 1 from both sides of the equation to isolate the term containing xx.

    12x+11=121\frac{1}{2}x + 1 - 1 = \frac{1}{2} - 1

    Simplifying the right side, we have:

    12x=121\frac{1}{2}x = \frac{1}{2} - 1

  • Step 2: Simplify the expression on the right side.

    121=1222=12\frac{1}{2} - 1 = \frac{1}{2} - \frac{2}{2} = -\frac{1}{2}

    So the equation becomes 12x=12\frac{1}{2}x = -\frac{1}{2}.

  • Step 3: Solve for xx by multiplying both sides of the equation by 2 to eliminate the fraction.

    2×12x=2×122 \times \frac{1}{2}x = 2 \times -\frac{1}{2}

    This simplifies to x=1x = -1.

Therefore, the solution to the equation is x=1 x = -1 .

Answer

1 -1

Exercise #13

Solve for X:

14x+3=12 -\frac{1}{4}x+3=\frac{1}{2}

Video Solution

Step-by-Step Solution

Let's solve the equation 14x+3=12-\frac{1}{4}x + 3 = \frac{1}{2} following these steps:

  • Step 1: Subtract 3 from both sides to eliminate the constant on the left.

14x+33=123 -\frac{1}{4}x + 3 - 3 = \frac{1}{2} - 3

14x=123 -\frac{1}{4}x = \frac{1}{2} - 3

Simplifying the right side gives:

14x=52 -\frac{1}{4}x = -\frac{5}{2}

  • Step 2: Multiply both sides by 4-4 to isolate xx.

x=52×(4) x = -\frac{5}{2} \times (-4)

x=202 x = \frac{20}{2}

x=10 x = 10

Thus, we find the solution to be x=10 x = 10 .

Answer

10 10

Exercise #14

Solve for X:

13x+5=69x -\frac{1}{3}x+5=\frac{6}{9}x

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Manipulate the equation to consolidate terms involving xx.
  • Step 2: Simplify the equation by fixing fractions.
  • Step 3: Solve for xx to find the solution.

Now, let's work through each step:
Step 1: Start with the original equation, 13x+5=69x-\frac{1}{3}x + 5 = \frac{6}{9}x. First, simplify 69\frac{6}{9} to 23\frac{2}{3}, giving us the equivalent equation:
13x+5=23x.-\frac{1}{3}x + 5 = \frac{2}{3}x.

Step 2: Move the 13x-\frac{1}{3}x term to the right side to consolidate terms,
5=23x+13x.5 = \frac{2}{3}x + \frac{1}{3}x.

Step 3: Simplify the terms involving xx on the right side. 23x+13x=33x=x.\frac{2}{3}x + \frac{1}{3}x = \frac{3}{3}x = x. Thus, the equation becomes:
5=x.5 = x.

Therefore, the solution to the equation is x=5 x = 5 .

Answer

5 5

Exercise #15

Solve for X:

3x+8=7x12 -3x+8=7x-12

Video Solution

Step-by-Step Solution

We will solve the equation step by step:

Given equation:
3x+8=7x12 -3x + 8 = 7x - 12

  • Step 1: Move all x x -terms to one side by adding 3x 3x to both sides.
    3x+3x+8=7x+3x12 -3x + 3x + 8 = 7x + 3x - 12
    This simplifies to:
    8=10x12 8 = 10x - 12
  • Step 2: Move constant terms to the opposite side by adding 12 12 to both sides.
    8+12=10x12+12 8 + 12 = 10x - 12 + 12
    Which simplifies to:
    20=10x 20 = 10x
  • Step 3: Solve for x x by dividing both sides by 10 10 .
    2010=10x10 \frac{20}{10} = \frac{10x}{10}
    This gives us:
    x=2 x = 2

Therefore, the solution to the equation is x=2 x = 2 .

Answer

2 2

Exercise #16

Solve for X:

5x8=10x+22 5x-8=10x+22

Video Solution

Step-by-Step Solution

First, we arrange the two sections so that the right side contains the values with the coefficient x and the left side the numbers without the x

Let's remember to maintain the plus and minus signs accordingly when we move terms between the sections.

First, we move a5x 5x to the right section and then the 22 to the left side. We obtain the following equation:

822=10x5x -8-22=10x-5x

We subtract both sides accordingly and obtain the following equation:

30=5x -30=5x

We divide both sections by 5 and obtain:

6=x -6=x

Answer

6 -6

Exercise #17

2x+75x12=8x+3 2x+7-5x-12=-8x+3

Video Solution

Step-by-Step Solution

To solve this exercise, we first need to identify that we have an equation with an unknown,

To solve such equations, the first step will be to arrange the equation so that on one side we have the numbers and on the other side the unknowns.

2X+75X12=8X+3 2X+7-5X-12=-8X+3

First, we'll move all unknowns to one side.
It's important to remember that when moving terms, the sign of the number changes (from negative to positive or vice versa).

2X+75X12+8X=3 2X+7-5X-12+8X=3

Now we'll do the same thing with the regular numbers.

2X5X+8X=37+12 2X-5X+8X=3-7+12

In the next step, we'll calculate the numbers according to the addition and subtraction signs.

2X5X=3X 2X-5X=-3X
3X+8X=5X -3X+8X=5X

37=4 3-7=-4
4+12=8 -4+12=8

5X=8 5X=8

At this stage, we want to get to a state where we have only one X X , not 5X 5X ,
so we'll divide both sides of the equation by the coefficient of the unknown (in this case - 5).

X=85 X={8\over5}

Answer

x=85 x=\frac{8}{5}

Exercise #18

Solve for X:

14+x=12x -\frac{1}{4}+x=-\frac{1}{2}x

Video Solution

Step-by-Step Solution

To solve the equation 14+x=12x-\frac{1}{4} + x = -\frac{1}{2}x, follow these steps:

  • Step 1: Begin by moving the terms involving xx to one side of the equation. We can do this by adding 12x\frac{1}{2}x to both sides. This gives:
    14+x+12x=0-\frac{1}{4} + x + \frac{1}{2}x = 0
  • Step 2: Recognize that x+12xx + \frac{1}{2}x can be combined into a single term:\br 14+32x=0-\frac{1}{4} + \frac{3}{2}x = 0
  • Step 3: Isolate 32x\frac{3}{2}x by adding 14\frac{1}{4} to both sides, resulting in:
    32x=14\frac{3}{2}x = \frac{1}{4}
  • Step 4: Solve for xx by multiplying both sides by 23\frac{2}{3}, which is the reciprocal of 32\frac{3}{2}:
    x=1423x = \frac{1}{4} \cdot \frac{2}{3}
  • Step 5: Simplify the multiplication on the right side:
    x=212=16x = \frac{2}{12} = \frac{1}{6}

Thus, the solution to the equation is x=16 x = \frac{1}{6} .

Answer

16 \frac{1}{6}

Exercise #19

Solve for X:

14x+8=3x12 -\frac{1}{4}x+8=3x-\frac{1}{2}

Video Solution

Step-by-Step Solution

To solve the equation 14x+8=3x12 -\frac{1}{4}x + 8 = 3x - \frac{1}{2} , follow these steps:

  • Step 1: Remove fractions by multiplying every term by the least common multiple of the denominators, which is 4.
    This gives 4(14x)+4×8=4×3x4×12 4 \left(-\frac{1}{4}x\right) + 4 \times 8 = 4 \times 3x - 4 \times \frac{1}{2} , simplifying to x+32=12x2-x + 32 = 12x - 2.
  • Step 2: Move all terms involving x x to one side by adding x x to both sides.
    This gives 32=13x2 32 = 13x - 2.
  • Step 3: Isolate x x by moving the constant to the other side: Add 2 to both sides to obtain 32+2=13x 32 + 2 = 13x , simplifying to 34=13x 34 = 13x .
  • Step 4: Solve for x x by dividing both sides by 13, leading to x=3413 x = \frac{34}{13} .
  • Step 5: Simplify the fraction if possible. Here, 3413 \frac{34}{13} is already in its simplest form. Converting to a mixed number, we get 2813 2\frac{8}{13} .

Therefore, the solution to the equation is x=2813 x = 2\frac{8}{13} .

Answer

2813 2\frac{8}{13}

Exercise #20

Solve for X:

18x+4=7x45 -\frac{1}{8}x+4=7x-\frac{4}{5}

Video Solution

Step-by-Step Solution

To solve the equation 18x+4=7x45-\frac{1}{8}x + 4 = 7x - \frac{4}{5}, follow these steps:

Step 1: Move the xx terms to one side of the equation.
Add 18x\frac{1}{8}x to both sides:

18x+18x+4=7x+18x454=7x+18x45 -\frac{1}{8}x + \frac{1}{8}x + 4 = 7x + \frac{1}{8}x - \frac{4}{5} \\ 4 = 7x + \frac{1}{8}x - \frac{4}{5}

Step 2: Simplify by combining like terms. Combine xx-terms on the right:

4=(7+18)x45 4 = \left(7 + \frac{1}{8}\right)x - \frac{4}{5}

Step 3: Express 7+187 + \frac{1}{8} as a single fraction: 568+18=578\frac{56}{8} + \frac{1}{8} = \frac{57}{8}.

Step 4: Substitute back:

4=578x45 4 = \frac{57}{8}x - \frac{4}{5}

Step 5: Move the constant term to the other side. Add 45\frac{4}{5} to both sides:

4+45=578x205+45=578x245=578x 4 + \frac{4}{5} = \frac{57}{8}x \\ \frac{20}{5} + \frac{4}{5} = \frac{57}{8}x \\ \frac{24}{5} = \frac{57}{8}x

Step 6: Solve for xx by dividing both sides by 578\frac{57}{8} (multiply by 857\frac{8}{57}):

x=245×857x=192285 x= \frac{24}{5} \times \frac{8}{57} \\ x = \frac{192}{285}

Therefore, the solution to the problem is x=192285 x = \frac{192}{285} .

Answer

192285 \frac{192}{285}