Solve 12x − 15 = 141

The solution of 12x − 15 = 141 is x = 13.

12x - 15 = 141\ \Rightarrow\ x = 13

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The lines y = 12x − 15 and y = 141 meet at x = 13. 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.
$12x - 15 = 141$
2
Add 15 to both sides:
$12x - 15 + 15 = 141 + 15 \ \Rightarrow\ 12x = 156$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{156}{12} \ \Rightarrow\ x = 13$
4
Check: put x = 13 back into the equation.
$12\cdot13 - 15 = 156 - 15 = 141 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 15 = 141\ \Rightarrow\ x = 13 \]
\[ 12x - 15 = 141 \]
\[ 12x - 15 + 15 = 141 + 15 \ \Rightarrow\ 12x = 156 \]
\[ \frac{12x}{12} = \frac{156}{12} \ \Rightarrow\ x = 13 \]
\[ 12\cdot13 - 15 = 156 - 15 = 141 \checkmark \]

Trying values of x in 12x − 15 = 141

x	12x − 15	Equals 141?
11	117	no
12	129	no
13	141	yes
14	153	no
15	165	no

Questions

What is x in 12x − 15 = 141?

The solution of 12x − 15 = 141 is x = 13.

How do you solve 12x − 15 = 141?

Add 15 to both sides to get 12x = 156, then divide both sides by 12 to get x = 13.

How do I check the answer?

Replace x by 13: 12(13) − 15 = 141, which is 141.

Solve 12x − 15 = 141

How to work it out

Trying values of x in 12x − 15 = 141

Questions

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