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Solve 3x + 3 = 21

The solution of 3x + 3 = 21 is x = 6.

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The lines y = 3x + 3 and y = 21 meet at x = 624681012510152025303540x = 6y = 3x + 3y = 21
The lines y = 3x + 3 and y = 21 meet at x = 6. 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=213x + 3 = 21
  2. 2

    Subtract 3 from both sides:

    3x+3−3=21−3 ⇒ 3x=183x + 3 - 3 = 21 - 3 \ \Rightarrow\ 3x = 18
  3. 3

    Divide both sides by 3:

    3x3=183 ⇒ x=6\frac{3x}{3} = \frac{18}{3} \ \Rightarrow\ x = 6
  4. 4

    Check: put x = 6 back into the equation.

    3⋅6+3=18+3=21✓3\cdot6 + 3 = 18 + 3 = 21 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 3 = 21\ \Rightarrow\ x = 6 \]
\[ 3x + 3 = 21 \]
\[ 3x + 3 - 3 = 21 - 3 \ \Rightarrow\ 3x = 18 \]
\[ \frac{3x}{3} = \frac{18}{3} \ \Rightarrow\ x = 6 \]
\[ 3\cdot6 + 3 = 18 + 3 = 21 \checkmark \]

Trying values of x in 3x + 3 = 21

x3x + 3Equals 21?
415no
518no
621yes
724no
827no

Questions

What is x in 3x + 3 = 21?

The solution of 3x + 3 = 21 is x = 6.

How do you solve 3x + 3 = 21?

Subtract 3 from both sides to get 3x = 18, then divide both sides by 3 to get x = 6.

How do I check the answer?

Replace x by 6: 3(6) + 3 = 21, which is 21.

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    Solve 3x + 3 = 21: x = 6 (steps and check) | WordGPT