Question

1. solve for a. 7a - 8 = 13

Explanation:

Step1: Add 8 to both sides

$7a - 8 + 8 = 13 + 8$
$7a = 21$

Step2: Divide by 7 on both sides

$\frac{7a}{7} = \frac{21}{7}$
$a = 3$

Answer:

$a=3$