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Solve 3x + 3 = 12

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

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The lines y = 3x + 3 and y = 12 meet at x = 3-22468-551015202530x = 3y = 3x + 3y = 12
The lines y = 3x + 3 and y = 12 meet at x = 3. 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+3=123x + 3 = 12
  2. 2

    Subtract 3 from both sides:

    3x+3−3=12−3 ⇒ 3x=93x + 3 - 3 = 12 - 3 \ \Rightarrow\ 3x = 9
  3. 3

    Divide both sides by 3:

    3x3=93 ⇒ x=3\frac{3x}{3} = \frac{9}{3} \ \Rightarrow\ x = 3
  4. 4

    Check: put x = 3 back into the equation.

    3⋅3+3=9+3=12✓3\cdot3 + 3 = 9 + 3 = 12 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 3 = 12\ \Rightarrow\ x = 3 \]
\[ 3x + 3 = 12 \]
\[ 3x + 3 - 3 = 12 - 3 \ \Rightarrow\ 3x = 9 \]
\[ \frac{3x}{3} = \frac{9}{3} \ \Rightarrow\ x = 3 \]
\[ 3\cdot3 + 3 = 9 + 3 = 12 \checkmark \]

Trying values of x in 3x + 3 = 12

x3x + 3Equals 12?
16no
29no
312yes
415no
518no

Questions

What is x in 3x + 3 = 12?

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

How do you solve 3x + 3 = 12?

Subtract 3 from both sides to get 3x = 9, then divide both sides by 3 to get x = 3.

How do I check the answer?

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

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