Question

36 = 1 + 7a\
-1 -1

Explanation:

Step1: Subtract 1 from both sides

$36 - 1 = 1 + 7a - 1$
$35 = 7a$

Step2: Divide both sides by 7

$\frac{35}{7} = \frac{7a}{7}$
$5 = a$

Answer:

$a = 5$