Examples with solutions for Simplifying and Combining Like Terms: Equations with variables on both sides

Exercise #1

16+a=17 -16+a=-17

Video Solution

Step-by-Step Solution

Let's solve the equation 16+a=17 -16 + a = -17 by isolating the variable a a .

To isolate a a , add 16 to both sides of the equation to cancel out the 16 -16 :

16+a+16=17+16 -16 + a + 16 = -17 + 16

This simplification results in:

a=1 a = -1

Thus, the solution to the equation 16+a=17 -16 + a = -17 is a=1 a = -1 .

If we review the answer choices given, the correct answer is Choice 4, 1 -1 .

The solution to the problem is a=1 a = -1 .

Answer

1 -1

Exercise #2

2+4y2y=4 2+4y-2y=4

Video Solution

Step-by-Step Solution

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

  • Step 1: Combine like terms.
  • Step 2: Simplify and isolate the variable.
  • Step 3: Solve for the variable.

Let's address each step in detail:
Step 1: Combine the like terms on the left side of the equation.
The original equation is: 2+4y2y=4 2 + 4y - 2y = 4 Combine the terms involving y y :
4y2y=2y 4y - 2y = 2y The equation now becomes:
2+2y=4 2 + 2y = 4 Step 2: Simplify the equation to isolate 2y 2y .
Subtract 2 from both sides to begin the process of isolating y y :
2y=42 2y = 4 - 2 Simplify the right side:
2y=2 2y = 2 Step 3: Solve for y y by dividing both sides by 2:
y=22 y = \frac{2}{2} This simplifies to:
y=1 y = 1 Thus, the solution to the equation is: y=1 y = 1 .

Answer

1 1

Exercise #3

Solve for b b :

8b=6 8-b=6

Video Solution

Step-by-Step Solution

First we will move terms so that -b remains remains on the left side of the equation.

We'll move 8 to the right-hand side, making sure to retain the plus and minus signs accordingly:

b=68 -b=6-8

Then we will subtract as follows:

b=2 -b=-2

Finally, we will divide both sides by -1 (be careful with the plus and minus signs when dividing by a negative):

b1=21 \frac{-b}{-1}=\frac{-2}{-1}

b=2 b=2

Answer

2 2

Exercise #4

x+x=8 x+x=8

Video Solution

Step-by-Step Solution

To solve the equation x+x=8 x + x = 8 , follow these steps:

  • Step 1: Combine like terms. Since the left side of the equation is x+x x + x , it can be simplified to 2x 2x . This gives us the equation 2x=8 2x = 8 .
  • Step 2: Solve for x x by isolating it. Divide both sides of the equation by 2 to get x x .
  • Performing the division gives x=82 x = \frac{8}{2} .
  • Step 3: Calculate the result of the division. 82=4 \frac{8}{2} = 4 .

Therefore, the solution to the equation is x=4 x = 4 .

Answer

4

Exercise #5

3x18+2x=32 3x-18+2x=32

Video Solution

Step-by-Step Solution

To solve the equation 3x18+2x=323x - 18 + 2x = 32, we begin by simplifying the left side:

  • Step 1: Combine like terms for the variable xx:
    The terms involving xx are 3x3x and 2x2x. Combining them gives 5x5x. So the equation becomes 5x18=325x - 18 = 32.
  • Step 2: Isolate the term with the variable:
    Add 18 to both sides of the equation to move the constant term to the right side:
    5x18+18=32+185x - 18 + 18 = 32 + 18
    This simplifies to 5x=505x = 50.
  • Step 3: Solve for xx:
    To isolate xx, divide both sides by 5:
    5x5=505\frac{5x}{5} = \frac{50}{5}
    This simplifies to x=10x = 10.

Therefore, the solution to the equation is x=10\mathbf{x = 10}.

Answer

10 10

Exercise #6

Solve for x:

5+x=3 5+x=3

Video Solution

Step-by-Step Solution

We will rearrange the equation so that x remains on the left side and we will move similar elements to the right side.

Remember that when we move a positive number, it will become a negative number, so we will get:

x=35 x=3-5

x=2 x=-2

Answer

-2

Exercise #7

Solve for x:

8(2x)=16 8(-2-x)=16

Video Solution

Step-by-Step Solution

First, we divide both sections by 8:

8(2x)8=168 \frac{8(-2-x)}{8}=\frac{16}{8}

Keep in mind that the 8 in the fraction of the left section is reduced, so the equation we get is:

2x=2 -2-x=2

We move the minus 2 to the right section and maintain the plus and minus signs accordingly:

x=2+2 -x=2+2

x=4 -x=4

We divide both sides by minus 1 and maintain the plus and minus signs accordingly when we divide:

x1=41 \frac{-x}{-1}=\frac{4}{-1}

x=4 x=-4

Answer

-4

Exercise #8

y+103y=150 y+10-3y=-150

Video Solution

Step-by-Step Solution

To solve the equation y+103y=150 y + 10 - 3y = -150 , follow these steps:

Step 1: Combine like terms on the left side of the equation:

y+103y y + 10 - 3y simplifies to 2y+10-2y + 10.

Now the equation is:

2y+10=150-2y + 10 = -150.

Step 2: Subtract 10 from both sides to begin isolating 2y-2y:

2y+1010=15010-2y + 10 - 10 = -150 - 10.

This simplifies to:

2y=160-2y = -160.

Step 3: Divide both sides by 2-2 to solve for y y :

2y2=1602\frac{-2y}{-2} = \frac{-160}{-2}.

Thus, y=80 y = 80 .

Therefore, the solution to the problem is y=80 y = 80 .

Answer

80 80

Exercise #9

y423=8 y-4\frac{2}{3}=8

Video Solution

Step-by-Step Solution

To solve the equation y423=8 y - 4\frac{2}{3} = 8 , follow these steps:

  • Step 1: Identify the given equation:
    y423=8 y - 4\frac{2}{3} = 8 .
  • Step 2: Solve for y y by eliminating the subtraction of 423 4\frac{2}{3} . We do this by adding 423 4\frac{2}{3} to both sides of the equation:
    y423+423=8+423 y - 4\frac{2}{3} + 4\frac{2}{3} = 8 + 4\frac{2}{3} .
  • Step 3: Simplify the left side:
    Since 423423=0 4\frac{2}{3} - 4\frac{2}{3} = 0 , the left side simplifies to just y y .
    Thus, y=8+423 y = 8 + 4\frac{2}{3} .
  • Step 4: Simplify the right side by converting the mixed number to an improper fraction:
    Convert 423 4\frac{2}{3} to an improper fraction: Multiply 4 by 3 and add 2, giving 143 \frac{14}{3} .
    Therefore, add 8+143 8 + \frac{14}{3} . Convert 8 to a fraction with denominator 3, which is 243 \frac{24}{3} .
    Now, add these fractions:
    243+143=383 \frac{24}{3} + \frac{14}{3} = \frac{38}{3} .
  • Step 5: Convert back to a mixed number (if desired):
    383=1223 \frac{38}{3} = 12\frac{2}{3} .

Therefore, the solution to the problem is y=1223 y = 12\frac{2}{3} .

Answer

1223 12\frac{2}{3}

Exercise #10

19=3a6+4a2a 19=3a-6+4a-2a

Video Solution

Step-by-Step Solution

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

  • Step 1: Simplify the equation by combining like terms.
  • Step 2: Isolate the variable a a to find its value.
  • Step 3: Verify the solution by substitution.

Now, let's work through each step:
Step 1: The given equation is 19=3a6+4a2a 19 = 3a - 6 + 4a - 2a .
First, combine the like terms involving a a :
3a+4a2a=5a 3a + 4a - 2a = 5a .
Now, the equation simplifies to 19=5a6 19 = 5a - 6 .

Step 2: Isolate a a by first adding 6 to both sides of the equation to eliminate the constant term on the right side:
19+6=5a 19 + 6 = 5a
25=5a 25 = 5a .

Next, divide both sides by 5 to solve for a a :
a=255 a = \frac{25}{5}
a=5 a = 5 .

Step 3: Verify the solution:
Substitute a=5 a = 5 back into the original equation:
19=3(5)6+4(5)2(5) 19 = 3(5) - 6 + 4(5) - 2(5)
Calculate each term: 3(5)=15 3(5) = 15 , 4(5)=20 4(5) = 20 , and 2(5)=10 2(5) = 10 .
Therefore, 19=156+2010 19 = 15 - 6 + 20 - 10 , which simplifies to 19=19 19 = 19 , confirming our solution is correct.

Therefore, the solution to the problem is a=5 a = 5 .

Answer

5 5

Exercise #11

Solve for X:

3x=4 -3-x=4

Video Solution

Step-by-Step Solution

To solve the equation 3x=4-3 - x = 4, let's follow these steps:

  • Start by isolating xx. We will first eliminate the x-x term from the left side by adding xx to both sides of the equation. This gives us:

3=4+x-3 = 4 + x

  • Now, subtract 44 from both sides to solve for xx. This step ensures xx is isolated:

34=x-3 - 4 = x

  • Calculate the result on the left side:

7=x-7 = x

Hence, the solution to the given equation is x=7 x = -7 .

Reviewing the choices, the correct choice is , which is 7-7.

Answer

-7

Exercise #12

2b+16+b=2 2b+16+b=-2

Video Solution

Step-by-Step Solution

To solve the equation 2b+16+b=2 2b + 16 + b = -2 , we'll follow these steps:

  • Step 1: Combine like terms on the left side of the equation.
  • Step 2: Isolate the variable b b on one side of the equation.
  • Step 3: Solve for b b .

Now, let's work through each step:

Step 1: Combine the terms with the variable b b on the left side. We have 2b+b=3b 2b + b = 3b . Thus, the equation becomes:

3b+16=2 3b + 16 = -2

Step 2: Subtract 16 from both sides to isolate the term with the variable:

3b+1616=216 3b + 16 - 16 = -2 - 16

Which simplifies to:

3b=18 3b = -18

Step 3: Divide both sides by 3 to solve for b b :

b=183 b = \frac{-18}{3}

The solution is:

b=6 b = -6

Therefore, the solution to the equation is b=6 b = -6 , corresponding to choice 1.

Answer

6 -6

Exercise #13

Solve for X:

3+x=8 -3+x=-8

Video Solution

Step-by-Step Solution

To solve the equation 3+x=8 -3 + x = -8 , we need to isolate the variable xx. We can do this by eliminating the constant term on the side with the variable.

Step 1: Add 3 to both sides of the equation to cancel out the 3-3 next to xx.
This gives us:

3+x+3=8+3-3 + x + 3 = -8 + 3

Step 2: Simplifying both sides of the equation results in:

x=5x = -5

Therefore, the solution to the equation is x=5 x = -5 , which matches choice 2.

Answer

-5

Exercise #14

6x+18+2x=64 6x+18+2x=6-4

Video Solution

Step-by-Step Solution

The equation we need to solve is 6x+18+2x=64 6x + 18 + 2x = 6 - 4 .

Step 1: Simplify each side of the equation.
On the left side, we have two like terms involving x x : 6x 6x and 2x 2x . We can combine these terms:

6x+2x=8x 6x + 2x = 8x .

Thus, the equation becomes:

8x+18=64 8x + 18 = 6 - 4 .

On the right side, simplify 64 6 - 4 to get:

2 2 .

The equation now reads:

8x+18=2 8x + 18 = 2 .

Step 2: Isolate the variable x x .
Subtract 18 from both sides to move the constant term on the right side:

8x+1818=218 8x + 18 - 18 = 2 - 18 .

This simplifies to:

8x=16 8x = -16 .

Next, divide both sides by 8 to solve for x x :

x=168 x = \frac{-16}{8} .

This simplifies to:

x=2 x = -2 .

Therefore, the solution to the equation 6x+18+2x=64 6x + 18 + 2x = 6 - 4 is x=2 x = -2 .

Answer

2 -2

Exercise #15

Solve for X:

3=5x 3=5-x

Video Solution

Step-by-Step Solution

To solve the equation 3=5x 3 = 5 - x , we need to isolate x x . We'll perform a sequence of simple algebraic manipulations:

  • Step 1: Add x x to both sides of the equation to move x x to the left side. This gives us:
  • 3+x=5 3 + x = 5

  • Step 2: Subtract 3 from both sides of the equation to solve for x x :
  • x=53 x = 5 - 3

  • Step 3: Simplify the right side:
  • x=2 x = 2

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

Answer

2

Exercise #16

Solve for X:

53x=8x17 5-3x=8x-17

Video Solution

Step-by-Step Solution

To solve this linear equation, follow these steps:

  • Step 1: Move all terms involving x x to one side of the equation.
  • Step 2: Move constant terms to the opposite side.
  • Step 3: Simplify the equation to isolate x x .
  • Step 4: Solve for x x by dividing by its coefficient.

Let's work through it:

Start with the given equation:
53x=8x17 5 - 3x = 8x - 17

Step 1: Add 3x 3x to both sides to move all x x terms to the right side:
5=11x17 5 = 11x - 17

Step 2: Add 17 17 to both sides to move the constants to the left side:
22=11x 22 = 11x

Step 3 & 4: Divide both sides by 11 11 to isolate x x :
x=2211 x = \frac{22}{11}

Simplifying the fraction gives:
x=2 x = 2

Hence, the solution to the problem is x=2 x = 2 .

Answer

2

Exercise #17

Solve for X:

22x+354x=318+10x -22x+35-4x=31-8+10x

Video Solution

Step-by-Step Solution

Let's solve the equation step by step:

Given equation: 22x+354x=318+10x -22x + 35 - 4x = 31 - 8 + 10x .

First, simplify both sides by combining like terms.

On the left side:

  • Combine all terms with x x : 22x4x=26x -22x - 4x = -26x .
  • The constant term remains: +35 +35 .
  • So, the left side simplifies to: 26x+35 -26x + 35 .

On the right side:

  • Simplify constants: 318=23 31 - 8 = 23 .
  • The term with x x remains: +10x +10x .
  • So, the right side simplifies to: 23+10x 23 + 10x .

The equation now is: 26x+35=23+10x -26x + 35 = 23 + 10x .

Next, move all terms involving x x to one side and constant terms to the other side:

  • Subtract 10x 10x from both sides: 26x10x+35=23 -26x - 10x + 35 = 23 .
  • Combine like terms: 36x+35=23 -36x + 35 = 23 .

Now, isolate the x x term:

  • Subtract 35 from both sides: 36x=2335 -36x = 23 - 35 .
  • Simplify the constants: 36x=12 -36x = -12 .

Finally, solve for x x by dividing both sides by 36-36:

  • x=1236 x = \frac{-12}{-36} .
  • Which simplifies to: x=13 x = \frac{1}{3} .

Therefore, the solution to the problem is x=13 x = \frac{1}{3} .

Answer

13 \frac{1}{3}

Exercise #18

Solve for X:

36x52+8x=19x+5431 36x-52+8x=19x+54-31

Video Solution

Step-by-Step Solution

To solve this equation, we'll proceed as follows:

  • Step 1: Simplify both sides of the equation by combining like terms.
  • Step 2: Move all terms with x x to one side of the equation.
  • Step 3: Isolate the variable x x and solve for it.

Now, let's follow these steps in detail:

Step 1: Simplify each side of the equation by combining like terms.

Left side: 36x52+8x 36x - 52 + 8x simplifies to (36x+8x)52=44x52 (36x + 8x) - 52 = 44x - 52 .

Right side: 19x+5431 19x + 54 - 31 simplifies to 19x+(5431)=19x+23 19x + (54 - 31) = 19x + 23 .

Thus, the equation becomes:

44x52=19x+23 44x - 52 = 19x + 23

Step 2: Move all x x terms to one side.

Subtract 19x 19x from both sides:

44x19x52=23 44x - 19x - 52 = 23

This simplifies to:

25x52=23 25x - 52 = 23

Step 3: Isolate the variable x x .

Add 52 to both sides:

25x=23+52 25x = 23 + 52

This gives 25x=75 25x = 75 .

Finally, divide both sides by 25:

x=7525 x = \frac{75}{25}

Thus, x=3 x = 3 .

Therefore, the solution to the problem is x=3 x = 3 , which corresponds to choice 2.

Answer

3 3

Exercise #19

Solve for X:

45+3x+99=5x+11x+2 -45+3x+99=5x+11x+2

Video Solution

Step-by-Step Solution

To solve the equation 45+3x+99=5x+11x+2 -45 + 3x + 99 = 5x + 11x + 2 , we'll proceed as follows:

Step 1: Combine like terms on both sides of the equation.

  • The left side becomes: 3x+9945=3x+54 3x + 99 - 45 = 3x + 54 .
  • The right side combines terms with x x : 5x+11x=16x 5x + 11x = 16x . Thus, the right side is 16x+2 16x + 2 .

The equation now looks like this: 3x+54=16x+2 3x + 54 = 16x + 2 .

Step 2: Move all terms involving x x to one side and constant terms to the other side.

Subtract 3x 3x from both sides to begin isolating x x :

  • This gives: 54=16x3x+2 54 = 16x - 3x + 2 , simplifying to 54=13x+2 54 = 13x + 2 .

Step 3: Isolate x x .

  • Subtract 2 2 from both sides: 542=13x 54 - 2 = 13x .
  • This simplifies to 52=13x 52 = 13x .
  • Divide both sides by 13 to solve for x x : x=5213 x = \frac{52}{13} .

Finally, simplify 5213=4 \frac{52}{13} = 4 .

Therefore, the solution to the problem is x=4 x = 4 .

Answer

4 4

Exercise #20

Solve for x:

9x=3+2x -9-x=3+2x

Video Solution

Step-by-Step Solution

To solve the equation, we will move similar elements to one side.

On the right side, we place the elements with X, while in the left side we place the elements without X.

Remember that when we move sides, the plus and minus signs change accordingly, so we get:

93=2x+x -9-3=2x+x

We calculate both sides:12=3x -12=3x

Finally, divide both sides by 3:

123=3x3 -\frac{12}{3}=\frac{3x}{3}

4=x -4=x

Answer

-4