Solve 6x − 12 = 18

The solution of 6x − 12 = 18 is x = 5.

6x - 12 = 18\ \Rightarrow\ x = 5

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The lines y = 6x − 12 and y = 18 meet at x = 5. 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.
$6x - 12 = 18$
2
Add 12 to both sides:
$6x - 12 + 12 = 18 + 12 \ \Rightarrow\ 6x = 30$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{30}{6} \ \Rightarrow\ x = 5$
4
Check: put x = 5 back into the equation.
$6\cdot5 - 12 = 30 - 12 = 18 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 12 = 18\ \Rightarrow\ x = 5 \]
\[ 6x - 12 = 18 \]
\[ 6x - 12 + 12 = 18 + 12 \ \Rightarrow\ 6x = 30 \]
\[ \frac{6x}{6} = \frac{30}{6} \ \Rightarrow\ x = 5 \]
\[ 6\cdot5 - 12 = 30 - 12 = 18 \checkmark \]

Trying values of x in 6x − 12 = 18

x	6x − 12	Equals 18?
3	6	no
4	12	no
5	18	yes
6	24	no
7	30	no

Questions

What is x in 6x − 12 = 18?

The solution of 6x − 12 = 18 is x = 5.

How do you solve 6x − 12 = 18?

Add 12 to both sides to get 6x = 30, then divide both sides by 6 to get x = 5.

How do I check the answer?

Replace x by 5: 6(5) − 12 = 18, which is 18.

Solve 6x − 12 = 18

How to work it out

Trying values of x in 6x − 12 = 18

Questions

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