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Solve 3x + 12 = 15

The solution of 3x + 12 = 15 is x = 1.

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The lines y = 3x + 12 and y = 15 meet at x = 1-4-2246-55101520253035x = 1y = 3x + 12y = 15
The lines y = 3x + 12 and y = 15 meet at x = 1. 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.

    3x+12=153x + 12 = 15
  2. 2

    Subtract 12 from both sides:

    3x+12−12=15−12 ⇒ 3x=33x + 12 - 12 = 15 - 12 \ \Rightarrow\ 3x = 3
  3. 3

    Divide both sides by 3:

    3x3=33 ⇒ x=1\frac{3x}{3} = \frac{3}{3} \ \Rightarrow\ x = 1
  4. 4

    Check: put x = 1 back into the equation.

    3⋅1+12=3+12=15✓3\cdot1 + 12 = 3 + 12 = 15 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 12 = 15\ \Rightarrow\ x = 1 \]
\[ 3x + 12 = 15 \]
\[ 3x + 12 - 12 = 15 - 12 \ \Rightarrow\ 3x = 3 \]
\[ \frac{3x}{3} = \frac{3}{3} \ \Rightarrow\ x = 1 \]
\[ 3\cdot1 + 12 = 3 + 12 = 15 \checkmark \]

Trying values of x in 3x + 12 = 15

x3x + 12Equals 15?
-19no
012no
115yes
218no
321no

Questions

What is x in 3x + 12 = 15?

The solution of 3x + 12 = 15 is x = 1.

How do you solve 3x + 12 = 15?

Subtract 12 from both sides to get 3x = 3, then divide both sides by 3 to get x = 1.

How do I check the answer?

Replace x by 1: 3(1) + 12 = 15, which is 15.

Similar equations

    Solve 3x + 12 = 15: x = 1 (steps and check) | WordGPT