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Solve 3x + 3 = 45

The solution of 3x + 3 = 45 is x = 14.

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The lines y = 3x + 3 and y = 45 meet at x = 148101214161820253035404550556065x = 14y = 3x + 3y = 45
The lines y = 3x + 3 and y = 45 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+3=453x + 3 = 45
  2. 2

    Subtract 3 from both sides:

    3x+3−3=45−3 ⇒ 3x=423x + 3 - 3 = 45 - 3 \ \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+3=42+3=45✓3\cdot14 + 3 = 42 + 3 = 45 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 3 = 45\ \Rightarrow\ x = 14 \]
\[ 3x + 3 = 45 \]
\[ 3x + 3 - 3 = 45 - 3 \ \Rightarrow\ 3x = 42 \]
\[ \frac{3x}{3} = \frac{42}{3} \ \Rightarrow\ x = 14 \]
\[ 3\cdot14 + 3 = 42 + 3 = 45 \checkmark \]

Trying values of x in 3x + 3 = 45

x3x + 3Equals 45?
1239no
1342no
1445yes
1548no
1651no

Questions

What is x in 3x + 3 = 45?

The solution of 3x + 3 = 45 is x = 14.

How do you solve 3x + 3 = 45?

Subtract 3 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) + 3 = 45, which is 45.

Similar equations

    Solve 3x + 3 = 45: x = 14 (steps and check) | WordGPT