Solve 3x − 7 = 29

The solution of 3x − 7 = 29 is x = 12.

3x - 7 = 29\ \Rightarrow\ x = 12

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The lines y = 3x − 7 and y = 29 meet at x = 12. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$3x - 7 = 29$
2
Add 7 to both sides:
$3x - 7 + 7 = 29 + 7 \ \Rightarrow\ 3x = 36$
3
Divide both sides by 3:
$\frac{3x}{3} = \frac{36}{3} \ \Rightarrow\ x = 12$
4
Check: put x = 12 back into the equation.
$3\cdot12 - 7 = 36 - 7 = 29 \checkmark$

LaTeX source of the formulas on this page

\[ 3x - 7 = 29\ \Rightarrow\ x = 12 \]
\[ 3x - 7 = 29 \]
\[ 3x - 7 + 7 = 29 + 7 \ \Rightarrow\ 3x = 36 \]
\[ \frac{3x}{3} = \frac{36}{3} \ \Rightarrow\ x = 12 \]
\[ 3\cdot12 - 7 = 36 - 7 = 29 \checkmark \]

Trying values of x in 3x − 7 = 29

x	3x − 7	Equals 29?
10	23	no
11	26	no
12	29	yes
13	32	no
14	35	no

Questions

What is x in 3x − 7 = 29?

The solution of 3x − 7 = 29 is x = 12.

How do you solve 3x − 7 = 29?

Add 7 to both sides to get 3x = 36, then divide both sides by 3 to get x = 12.

How do I check the answer?

Replace x by 12: 3(12) − 7 = 29, which is 29.

Solve 3x − 7 = 29

How to work it out

Trying values of x in 3x − 7 = 29

Questions

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