Examples with solutions for Solving Equations by using Addition/ Subtraction: Binomial

Exercise #1

Solve for X:

x+7=12 x + 7 = 12

Step-by-Step Solution

To solve for x x , start by isolating x x on one side of the equation:
Subtract 7 from both sides:
x+77=127 x + 7 - 7 = 12 - 7 simplifies to
x=5 x = 5 .

Answer

5

Exercise #2

Solve for X:

x+8=10 x + 8 = 10

Step-by-Step Solution

To solve for x x , start by isolating x x on one side of the equation:
Subtract 8 from both sides:
x+88=108 x + 8 - 8 = 10 - 8 simplifies to
x=2 x = 2 .

Answer

2

Exercise #3

Solve for X:

x+3=7 x + 3 = 7

Step-by-Step Solution

To solve for x x , start by isolating x x on one side of the equation:
Subtract 3 from both sides:
x+33=73 x + 3 - 3 = 7 - 3 simplifies to
x=4 x = 4 .

Answer

4

Exercise #4

Solve for X:

6x=102 6 - x = 10 - 2

Step-by-Step Solution

To solve the equation 6x=102 6 - x = 10 - 2 , follow these steps:

  1. First, simplify both sides of the equation:

  2. On the right side, calculate 102=8 10 - 2 = 8 .

  3. The equation simplifies to 6x=8 6 - x = 8 .

  4. To isolate x, subtract 6 from both sides:

  5. 6x6=86 6 - x - 6 = 8 - 6

  6. This simplifies to x=2 -x = 2 .

  7. Multiply both sides by -1 to solve for x:

  8. x=2×1=2 x = -2 \times -1 = 2 .

  9. Since the problem requires only manipulation by transferring terms, the initial approach to the equation setup should lead to x = 4 as the solution before re-evaluation.

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

Answer

2

Exercise #5

Solve for X:

5x=124 5 - x = 12 - 4

Step-by-Step Solution

First, simplify the right side of the equation:
124=8 12 - 4 = 8
Hence, the equation becomes 5x=8 5 - x = 8 .
Subtract 5 from both sides to isolate x x :
5x5=85 5 - x - 5 = 8 - 5
This simplifies to:
x=3 -x=3
Divide by -1 to solve for x x :
x=3 x=-3
Therefore, the solution is x=3 x=-3 .

Answer

-3

Exercise #6

Solve for X:

7x=155 7 - x = 15 - 5

Step-by-Step Solution

First, simplify the right side of the equation:
155=10 15 - 5 = 10
Hence, the equation becomes 7x=10 7 - x = 10 .
Subtract 7 from both sides to isolate x x :
7x7=107 7 - x - 7 = 10 - 7
This simplifies to:
x=3 -x=3
Divide by -1 to solve forx x :
x=3 x=-3
Therefore, the solution is x=3 x=-3 .

Answer

-3

Exercise #7

Solve for X:

9x=167 9 - x = 16 - 7

Step-by-Step Solution

First, simplify the right side of the equation:
167=9 16 - 7 = 9
Hence, the equation becomes 9x=9 9 - x = 9 .
Since both sides are equal, x x must be 0 0 .
Therefore, the solution is x=0 x = 0 .

Answer

0

Exercise #8

Solve for X:

3x=106 3 - x = 10 - 6

Step-by-Step Solution

First, simplify the right side of the equation:
106=4 10 - 6 = 4
Hence, the equation becomes 3x=4 3 - x = 4 .
Subtract 3 from both sides to isolate x x :
3x3=43 3 - x - 3 = 4 - 3
This simplifies to:
x=1 -x=1
Divide by -1 to solve forx x :
x=1 x=-1
Therefore, the solution is x=1 x = 1 .

Answer

-1

Exercise #9

Solve for X:

3+x2=73 3 + x - 2 = 7 - 3

Step-by-Step Solution

First, simplify both sides of the equation:

Left side: 3+x2=1+x 3 + x - 2 = 1 + x

Right side: 73=4 7 - 3 = 4

So the equation becomes:

1+x=4 1 + x = 4

Next, isolate x x by subtracting 1 from both sides:

1+x1=41 1 + x - 1 = 4 - 1

This simplifies to:

x=3 x = 3

Answer

3

Exercise #10

Solve for X:

5+x3=2+1 5 + x - 3 = 2 + 1

Step-by-Step Solution

To solve 5+x3=2+1 5 + x - 3 = 2 + 1 , we first simplify both sides:

Left side:
53+x=2+x 5 - 3 + x = 2 + x

Right side:
2+1=3 2 + 1 = 3

Now the equation is 2+x=3 2 + x = 3 .

Subtract 2 from both sides:
x=32 x = 3 - 2

So, x=1 x = 1 .

Answer

1

Exercise #11

Solve for X:

3+x+1=62 3 + x + 1 = 6 - 2

Step-by-Step Solution

To solve 3+x+1=62 3 + x + 1 = 6 - 2 , we first simplify both sides:

Left side:
3+1+x=4+x 3 + 1 + x = 4 + x

Right side:
62=4 6 - 2 = 4

Now the equation is 4+x=4 4 + x = 4 .

Subtract 4 from both sides:
x=44 x = 4 - 4

So, x=0 x = 0 .

Answer

0

Exercise #12

Solve for X:

x+42=6+1 x + 4 - 2 = 6 + 1

Step-by-Step Solution

First, simplify both sides of the equation:

Left side: x+42=x+2 x + 4 - 2 = x + 2

Right side: 6+1=7 6 + 1 = 7

Now the equation is: x+2=7 x + 2 = 7

Subtract 2 from both sides to isolatex x :

x+22=72 x + 2 - 2 = 7 - 2

Simplifying gives:

x=5 x = 5

Answer

5

Exercise #13

Solve for X:

x3+5=82 x - 3 + 5 = 8 - 2

Step-by-Step Solution

First, simplify both sides of the equation:

Left side: x3+5=x+2 x - 3 + 5 = x + 2

Right side: 82=6 8 - 2 = 6

Now the equation is: x+2=6 x + 2 = 6

Subtract 2 from both sides to isolate x x :

x+22=62 x + 2 - 2 = 6 - 2

Simplifying gives:

x=4 x = 4

Answer

4

Exercise #14

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 #15

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 #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

5b+2b7+14=0 5b+2b-7+14=0

b=? b=?

Video Solution

Step-by-Step Solution

It's important to remember that when we have regular numbers and unknowns, we cannot add or subtract them directly.

Let's collect like terms:

 

5b+2b-7+14=0

7b+7 = 0

Let's move terms

7b = -7

Let's divide by 7

b=-1

And that's the solution!

Answer

1 -1

Exercise #18

Solve for X:

7x3=4x+9 7x - 3 = 4x + 9

Step-by-Step Solution

To solve the equation 7x3=4x+9 7x - 3 = 4x + 9 , follow these steps:

1. Subtract 4x 4x from both sides to get:

7x4x3=9 7x - 4x - 3 = 9

2. Simplify the equation:

3x3=9 3x - 3 = 9

3. Add 3 3 to both sides:

3x=12 3x = 12

4. Divide both sides by 3 3 :

x=4 x=4

Answer

4

Exercise #19

Solve for X:

3x+7=5 3-x+7=5

Video Solution

Answer

5

Exercise #20

Solve for X:

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

Video Solution

Answer

8 8