Question

what is the solution to this equation?
$2a + 5 = 15$
$\bigcirc$ $a = 12$
$\bigcirc$ $a = 10$
$\bigcirc$ $a = 8$
$\bigcirc$ $a = 5$

Explanation:

Step1: Subtract 5 from both sides

$2a + 5 - 5 = 15 - 5$
$2a = 10$

Step2: Divide by 2 on both sides

$\frac{2a}{2} = \frac{10}{2}$
$a = 5$

Answer:

$a=5$ (the last option)