Solve 6x − 12 = 30

The solution of 6x − 12 = 30 is x = 7.

6x - 12 = 30\ \Rightarrow\ x = 7

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The lines y = 6x − 12 and y = 30 meet at x = 7. 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.
$6x - 12 = 30$
2
Add 12 to both sides:
$6x - 12 + 12 = 30 + 12 \ \Rightarrow\ 6x = 42$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{42}{6} \ \Rightarrow\ x = 7$
4
Check: put x = 7 back into the equation.
$6\cdot7 - 12 = 42 - 12 = 30 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 12 = 30\ \Rightarrow\ x = 7 \]
\[ 6x - 12 = 30 \]
\[ 6x - 12 + 12 = 30 + 12 \ \Rightarrow\ 6x = 42 \]
\[ \frac{6x}{6} = \frac{42}{6} \ \Rightarrow\ x = 7 \]
\[ 6\cdot7 - 12 = 42 - 12 = 30 \checkmark \]

Trying values of x in 6x − 12 = 30

x	6x − 12	Equals 30?
5	18	no
6	24	no
7	30	yes
8	36	no
9	42	no

Questions

What is x in 6x − 12 = 30?

The solution of 6x − 12 = 30 is x = 7.

How do you solve 6x − 12 = 30?

Add 12 to both sides to get 6x = 42, then divide both sides by 6 to get x = 7.

How do I check the answer?

Replace x by 7: 6(7) − 12 = 30, which is 30.

Solve 6x − 12 = 30

How to work it out

Trying values of x in 6x − 12 = 30

Questions

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