WordGPT

Solve 9x + 12 = 138

The solution of 9x + 12 = 138 is x = 14.

Explain it step by step in chatMake a short video of it
The lines y = 9x + 12 and y = 138 meet at x = 14810121416182080100120140160180200x = 14y = 9x + 12y = 138
The lines y = 9x + 12 and y = 138 meet at x = 14. 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.

    9x+12=1389x + 12 = 138
  2. 2

    Subtract 12 from both sides:

    9x+12−12=138−12 ⇒ 9x=1269x + 12 - 12 = 138 - 12 \ \Rightarrow\ 9x = 126
  3. 3

    Divide both sides by 9:

    9x9=1269 ⇒ x=14\frac{9x}{9} = \frac{126}{9} \ \Rightarrow\ x = 14
  4. 4

    Check: put x = 14 back into the equation.

    9⋅14+12=126+12=138✓9\cdot14 + 12 = 126 + 12 = 138 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 12 = 138\ \Rightarrow\ x = 14 \]
\[ 9x + 12 = 138 \]
\[ 9x + 12 - 12 = 138 - 12 \ \Rightarrow\ 9x = 126 \]
\[ \frac{9x}{9} = \frac{126}{9} \ \Rightarrow\ x = 14 \]
\[ 9\cdot14 + 12 = 126 + 12 = 138 \checkmark \]

Trying values of x in 9x + 12 = 138

x9x + 12Equals 138?
12120no
13129no
14138yes
15147no
16156no

Questions

What is x in 9x + 12 = 138?

The solution of 9x + 12 = 138 is x = 14.

How do you solve 9x + 12 = 138?

Subtract 12 from both sides to get 9x = 126, then divide both sides by 9 to get x = 14.

How do I check the answer?

Replace x by 14: 9(14) + 12 = 138, which is 138.

Similar equations

    Solve 9x + 12 = 138: x = 14 (steps and check) | WordGPT