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Solve 3x + 9 = 30

The solution of 3x + 9 = 30 is x = 7.

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The lines y = 3x + 9 and y = 30 meet at x = 724681012101520253035404550x = 7y = 3x + 9y = 30
The lines y = 3x + 9 and y = 30 meet at x = 7. 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+9=303x + 9 = 30
  2. 2

    Subtract 9 from both sides:

    3x+9−9=30−9 ⇒ 3x=213x + 9 - 9 = 30 - 9 \ \Rightarrow\ 3x = 21
  3. 3

    Divide both sides by 3:

    3x3=213 ⇒ x=7\frac{3x}{3} = \frac{21}{3} \ \Rightarrow\ x = 7
  4. 4

    Check: put x = 7 back into the equation.

    3⋅7+9=21+9=30✓3\cdot7 + 9 = 21 + 9 = 30 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 9 = 30\ \Rightarrow\ x = 7 \]
\[ 3x + 9 = 30 \]
\[ 3x + 9 - 9 = 30 - 9 \ \Rightarrow\ 3x = 21 \]
\[ \frac{3x}{3} = \frac{21}{3} \ \Rightarrow\ x = 7 \]
\[ 3\cdot7 + 9 = 21 + 9 = 30 \checkmark \]

Trying values of x in 3x + 9 = 30

x3x + 9Equals 30?
524no
627no
730yes
833no
936no

Questions

What is x in 3x + 9 = 30?

The solution of 3x + 9 = 30 is x = 7.

How do you solve 3x + 9 = 30?

Subtract 9 from both sides to get 3x = 21, then divide both sides by 3 to get x = 7.

How do I check the answer?

Replace x by 7: 3(7) + 9 = 30, which is 30.

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    Solve 3x + 9 = 30: x = 7 (steps and check) | WordGPT