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Solve 8x + 5 = 125

The solution of 8x + 5 = 125 is x = 15.

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The lines y = 8x + 5 and y = 125 meet at x = 1510121416182080100120140160180x = 15y = 8x + 5y = 125
The lines y = 8x + 5 and y = 125 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+5=1258x + 5 = 125
  2. 2

    Subtract 5 from both sides:

    8x+5−5=125−5 ⇒ 8x=1208x + 5 - 5 = 125 - 5 \ \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+5=120+5=125✓8\cdot15 + 5 = 120 + 5 = 125 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 5 = 125\ \Rightarrow\ x = 15 \]
\[ 8x + 5 = 125 \]
\[ 8x + 5 - 5 = 125 - 5 \ \Rightarrow\ 8x = 120 \]
\[ \frac{8x}{8} = \frac{120}{8} \ \Rightarrow\ x = 15 \]
\[ 8\cdot15 + 5 = 120 + 5 = 125 \checkmark \]

Trying values of x in 8x + 5 = 125

x8x + 5Equals 125?
13109no
14117no
15125yes
16133no
17141no

Questions

What is x in 8x + 5 = 125?

The solution of 8x + 5 = 125 is x = 15.

How do you solve 8x + 5 = 125?

Subtract 5 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) + 5 = 125, which is 125.

Similar equations

    Solve 8x + 5 = 125: x = 15 (steps and check) | WordGPT