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Solve 3x + 15 = 57

The solution of 3x + 15 = 57 is x = 14.

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The lines y = 3x + 15 and y = 57 meet at x = 1481012141618204045505560657075x = 14y = 3x + 15y = 57
The lines y = 3x + 15 and y = 57 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.

    3x+15=573x + 15 = 57
  2. 2

    Subtract 15 from both sides:

    3x+15−15=57−15 ⇒ 3x=423x + 15 - 15 = 57 - 15 \ \Rightarrow\ 3x = 42
  3. 3

    Divide both sides by 3:

    3x3=423 ⇒ x=14\frac{3x}{3} = \frac{42}{3} \ \Rightarrow\ x = 14
  4. 4

    Check: put x = 14 back into the equation.

    3⋅14+15=42+15=57✓3\cdot14 + 15 = 42 + 15 = 57 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 15 = 57\ \Rightarrow\ x = 14 \]
\[ 3x + 15 = 57 \]
\[ 3x + 15 - 15 = 57 - 15 \ \Rightarrow\ 3x = 42 \]
\[ \frac{3x}{3} = \frac{42}{3} \ \Rightarrow\ x = 14 \]
\[ 3\cdot14 + 15 = 42 + 15 = 57 \checkmark \]

Trying values of x in 3x + 15 = 57

x3x + 15Equals 57?
1251no
1354no
1457yes
1560no
1663no

Questions

What is x in 3x + 15 = 57?

The solution of 3x + 15 = 57 is x = 14.

How do you solve 3x + 15 = 57?

Subtract 15 from both sides to get 3x = 42, then divide both sides by 3 to get x = 14.

How do I check the answer?

Replace x by 14: 3(14) + 15 = 57, which is 57.

Similar equations

    Solve 3x + 15 = 57: x = 14 (steps and check) | WordGPT