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Solve 3x + 15 = 66

The solution of 3x + 15 = 66 is x = 17.

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The lines y = 3x + 15 and y = 66 meet at x = 17121416182022455055606570758085x = 17y = 3x + 15y = 66
The lines y = 3x + 15 and y = 66 meet at x = 17. 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=663x + 15 = 66
  2. 2

    Subtract 15 from both sides:

    3x+15−15=66−15 ⇒ 3x=513x + 15 - 15 = 66 - 15 \ \Rightarrow\ 3x = 51
  3. 3

    Divide both sides by 3:

    3x3=513 ⇒ x=17\frac{3x}{3} = \frac{51}{3} \ \Rightarrow\ x = 17
  4. 4

    Check: put x = 17 back into the equation.

    3⋅17+15=51+15=66✓3\cdot17 + 15 = 51 + 15 = 66 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 15 = 66\ \Rightarrow\ x = 17 \]
\[ 3x + 15 = 66 \]
\[ 3x + 15 - 15 = 66 - 15 \ \Rightarrow\ 3x = 51 \]
\[ \frac{3x}{3} = \frac{51}{3} \ \Rightarrow\ x = 17 \]
\[ 3\cdot17 + 15 = 51 + 15 = 66 \checkmark \]

Trying values of x in 3x + 15 = 66

x3x + 15Equals 66?
1560no
1663no
1766yes
1869no
1972no

Questions

What is x in 3x + 15 = 66?

The solution of 3x + 15 = 66 is x = 17.

How do you solve 3x + 15 = 66?

Subtract 15 from both sides to get 3x = 51, then divide both sides by 3 to get x = 17.

How do I check the answer?

Replace x by 17: 3(17) + 15 = 66, which is 66.

Similar equations

    Solve 3x + 15 = 66: x = 17 (steps and check) | WordGPT