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Solve 8x + 8 = 128

The solution of 8x + 8 = 128 is x = 15.

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The lines y = 8x + 8 and y = 128 meet at x = 1510121416182080100120140160180x = 15y = 8x + 8y = 128
The lines y = 8x + 8 and y = 128 meet at x = 15. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    8x+8=1288x + 8 = 128
  2. 2

    Subtract 8 from both sides:

    8x+8−8=128−8 ⇒ 8x=1208x + 8 - 8 = 128 - 8 \ \Rightarrow\ 8x = 120
  3. 3

    Divide both sides by 8:

    8x8=1208 ⇒ x=15\frac{8x}{8} = \frac{120}{8} \ \Rightarrow\ x = 15
  4. 4

    Check: put x = 15 back into the equation.

    8⋅15+8=120+8=128✓8\cdot15 + 8 = 120 + 8 = 128 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 8 = 128\ \Rightarrow\ x = 15 \]
\[ 8x + 8 = 128 \]
\[ 8x + 8 - 8 = 128 - 8 \ \Rightarrow\ 8x = 120 \]
\[ \frac{8x}{8} = \frac{120}{8} \ \Rightarrow\ x = 15 \]
\[ 8\cdot15 + 8 = 120 + 8 = 128 \checkmark \]

Trying values of x in 8x + 8 = 128

x8x + 8Equals 128?
13112no
14120no
15128yes
16136no
17144no

Questions

What is x in 8x + 8 = 128?

The solution of 8x + 8 = 128 is x = 15.

How do you solve 8x + 8 = 128?

Subtract 8 from both sides to get 8x = 120, then divide both sides by 8 to get x = 15.

How do I check the answer?

Replace x by 15: 8(15) + 8 = 128, which is 128.

Similar equations

    Solve 8x + 8 = 128: x = 15 (steps and check) | WordGPT