Solve 12x − 13 = 155

The solution of 12x − 13 = 155 is x = 14.

12x - 13 = 155\ \Rightarrow\ x = 14

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The lines y = 12x − 13 and y = 155 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
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$12x - 13 = 155$
2
Add 13 to both sides:
$12x - 13 + 13 = 155 + 13 \ \Rightarrow\ 12x = 168$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{168}{12} \ \Rightarrow\ x = 14$
4
Check: put x = 14 back into the equation.
$12\cdot14 - 13 = 168 - 13 = 155 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 13 = 155\ \Rightarrow\ x = 14 \]
\[ 12x - 13 = 155 \]
\[ 12x - 13 + 13 = 155 + 13 \ \Rightarrow\ 12x = 168 \]
\[ \frac{12x}{12} = \frac{168}{12} \ \Rightarrow\ x = 14 \]
\[ 12\cdot14 - 13 = 168 - 13 = 155 \checkmark \]

Trying values of x in 12x − 13 = 155

x	12x − 13	Equals 155?
12	131	no
13	143	no
14	155	yes
15	167	no
16	179	no

Questions

What is x in 12x − 13 = 155?

The solution of 12x − 13 = 155 is x = 14.

How do you solve 12x − 13 = 155?

Add 13 to both sides to get 12x = 168, then divide both sides by 12 to get x = 14.

How do I check the answer?

Replace x by 14: 12(14) − 13 = 155, which is 155.

Solve 12x − 13 = 155

How to work it out

Trying values of x in 12x − 13 = 155

Questions

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