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Solve 3x + 12 = 57

The solution of 3x + 12 = 57 is x = 15.

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The lines y = 3x + 12 and y = 57 meet at x = 151012141618204045505560657075x = 15y = 3x + 12y = 57
The lines y = 3x + 12 and y = 57 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.

    3x+12=573x + 12 = 57
  2. 2

    Subtract 12 from both sides:

    3x+12−12=57−12 ⇒ 3x=453x + 12 - 12 = 57 - 12 \ \Rightarrow\ 3x = 45
  3. 3

    Divide both sides by 3:

    3x3=453 ⇒ x=15\frac{3x}{3} = \frac{45}{3} \ \Rightarrow\ x = 15
  4. 4

    Check: put x = 15 back into the equation.

    3⋅15+12=45+12=57✓3\cdot15 + 12 = 45 + 12 = 57 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 12 = 57\ \Rightarrow\ x = 15 \]
\[ 3x + 12 = 57 \]
\[ 3x + 12 - 12 = 57 - 12 \ \Rightarrow\ 3x = 45 \]
\[ \frac{3x}{3} = \frac{45}{3} \ \Rightarrow\ x = 15 \]
\[ 3\cdot15 + 12 = 45 + 12 = 57 \checkmark \]

Trying values of x in 3x + 12 = 57

x3x + 12Equals 57?
1351no
1454no
1557yes
1660no
1763no

Questions

What is x in 3x + 12 = 57?

The solution of 3x + 12 = 57 is x = 15.

How do you solve 3x + 12 = 57?

Subtract 12 from both sides to get 3x = 45, then divide both sides by 3 to get x = 15.

How do I check the answer?

Replace x by 15: 3(15) + 12 = 57, which is 57.

Similar equations

    Solve 3x + 12 = 57: x = 15 (steps and check) | WordGPT