Question

-12 = 6x - 72

Explanation:

Step1: Add 72 to both sides

$-12 + 72 = 6x - 72 + 72$
$60 = 6x$

Step2: Divide by 6 on both sides

$\frac{60}{6} = \frac{6x}{6}$
$10 = x$

Answer:

$x=10$