Solve 6x − 12 = 108

The solution of 6x − 12 = 108 is x = 20.

6x - 12 = 108\ \Rightarrow\ x = 20

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The lines y = 6x − 12 and y = 108 meet at x = 20. 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.
$6x - 12 = 108$
2
Add 12 to both sides:
$6x - 12 + 12 = 108 + 12 \ \Rightarrow\ 6x = 120$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{120}{6} \ \Rightarrow\ x = 20$
4
Check: put x = 20 back into the equation.
$6\cdot20 - 12 = 120 - 12 = 108 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 12 = 108\ \Rightarrow\ x = 20 \]
\[ 6x - 12 = 108 \]
\[ 6x - 12 + 12 = 108 + 12 \ \Rightarrow\ 6x = 120 \]
\[ \frac{6x}{6} = \frac{120}{6} \ \Rightarrow\ x = 20 \]
\[ 6\cdot20 - 12 = 120 - 12 = 108 \checkmark \]

Trying values of x in 6x − 12 = 108

x	6x − 12	Equals 108?
18	96	no
19	102	no
20	108	yes
21	114	no
22	120	no

Questions

What is x in 6x − 12 = 108?

The solution of 6x − 12 = 108 is x = 20.

How do you solve 6x − 12 = 108?

Add 12 to both sides to get 6x = 120, then divide both sides by 6 to get x = 20.

How do I check the answer?

Replace x by 20: 6(20) − 12 = 108, which is 108.

Solve 6x − 12 = 108

How to work it out

Trying values of x in 6x − 12 = 108

Questions

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