Solve 6x − 12 = 66

The solution of 6x − 12 = 66 is x = 13.

6x - 12 = 66\ \Rightarrow\ x = 13

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The lines y = 6x − 12 and y = 66 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.
$6x - 12 = 66$
2
Add 12 to both sides:
$6x - 12 + 12 = 66 + 12 \ \Rightarrow\ 6x = 78$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{78}{6} \ \Rightarrow\ x = 13$
4
Check: put x = 13 back into the equation.
$6\cdot13 - 12 = 78 - 12 = 66 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 12 = 66\ \Rightarrow\ x = 13 \]
\[ 6x - 12 = 66 \]
\[ 6x - 12 + 12 = 66 + 12 \ \Rightarrow\ 6x = 78 \]
\[ \frac{6x}{6} = \frac{78}{6} \ \Rightarrow\ x = 13 \]
\[ 6\cdot13 - 12 = 78 - 12 = 66 \checkmark \]

Trying values of x in 6x − 12 = 66

x	6x − 12	Equals 66?
11	54	no
12	60	no
13	66	yes
14	72	no
15	78	no

Questions

What is x in 6x − 12 = 66?

The solution of 6x − 12 = 66 is x = 13.

How do you solve 6x − 12 = 66?

Add 12 to both sides to get 6x = 78, then divide both sides by 6 to get x = 13.

How do I check the answer?

Replace x by 13: 6(13) − 12 = 66, which is 66.

Solve 6x − 12 = 66

How to work it out

Trying values of x in 6x − 12 = 66

Questions

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