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Solve 12x + 15 = 123

The solution of 12x + 15 = 123 is x = 9.

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The lines y = 12x + 15 and y = 123 meet at x = 9468101214406080100120140160180200x = 9y = 12x + 15y = 123
The lines y = 12x + 15 and y = 123 meet at x = 9. 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.

    12x+15=12312x + 15 = 123
  2. 2

    Subtract 15 from both sides:

    12x+15−15=123−15 ⇒ 12x=10812x + 15 - 15 = 123 - 15 \ \Rightarrow\ 12x = 108
  3. 3

    Divide both sides by 12:

    12x12=10812 ⇒ x=9\frac{12x}{12} = \frac{108}{12} \ \Rightarrow\ x = 9
  4. 4

    Check: put x = 9 back into the equation.

    12⋅9+15=108+15=123✓12\cdot9 + 15 = 108 + 15 = 123 \checkmark
LaTeX source of the formulas on this page
\[ 12x + 15 = 123\ \Rightarrow\ x = 9 \]
\[ 12x + 15 = 123 \]
\[ 12x + 15 - 15 = 123 - 15 \ \Rightarrow\ 12x = 108 \]
\[ \frac{12x}{12} = \frac{108}{12} \ \Rightarrow\ x = 9 \]
\[ 12\cdot9 + 15 = 108 + 15 = 123 \checkmark \]

Trying values of x in 12x + 15 = 123

x12x + 15Equals 123?
799no
8111no
9123yes
10135no
11147no

Questions

What is x in 12x + 15 = 123?

The solution of 12x + 15 = 123 is x = 9.

How do you solve 12x + 15 = 123?

Subtract 15 from both sides to get 12x = 108, then divide both sides by 12 to get x = 9.

How do I check the answer?

Replace x by 9: 12(9) + 15 = 123, which is 123.

Similar equations

    Solve 12x + 15 = 123: x = 9 (steps and check) | WordGPT