Question

1. $13 = 10x - 7$

Explanation:

Step1: Isolate the term with $x$

Add 7 to both sides:
$13 + 7 = 10x - 7 + 7$
$20 = 10x$

Step2: Solve for $x$

Divide both sides by 10:
$\frac{20}{10} = \frac{10x}{10}$
$2 = x$

Answer:

$x=2$