Solve 12x − 12 = 120

The solution of 12x − 12 = 120 is x = 11.

12x - 12 = 120\ \Rightarrow\ x = 11

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The lines y = 12x − 12 and y = 120 meet at x = 11. 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.
$12x - 12 = 120$
2
Add 12 to both sides:
$12x - 12 + 12 = 120 + 12 \ \Rightarrow\ 12x = 132$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{132}{12} \ \Rightarrow\ x = 11$
4
Check: put x = 11 back into the equation.
$12\cdot11 - 12 = 132 - 12 = 120 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 12 = 120\ \Rightarrow\ x = 11 \]
\[ 12x - 12 = 120 \]
\[ 12x - 12 + 12 = 120 + 12 \ \Rightarrow\ 12x = 132 \]
\[ \frac{12x}{12} = \frac{132}{12} \ \Rightarrow\ x = 11 \]
\[ 12\cdot11 - 12 = 132 - 12 = 120 \checkmark \]

Trying values of x in 12x − 12 = 120

x	12x − 12	Equals 120?
9	96	no
10	108	no
11	120	yes
12	132	no
13	144	no

Questions

What is x in 12x − 12 = 120?

The solution of 12x − 12 = 120 is x = 11.

How do you solve 12x − 12 = 120?

Add 12 to both sides to get 12x = 132, then divide both sides by 12 to get x = 11.

How do I check the answer?

Replace x by 11: 12(11) − 12 = 120, which is 120.

Solve 12x − 12 = 120

How to work it out

Trying values of x in 12x − 12 = 120

Questions

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