We need to solve the equation $\frac{b}{3} + 15 = -8$ for the variable $b$.

1. Problem Description

We need to solve the equation $\frac{b}{3} + 15 = -8$ for the variable $b$.

2. Solution Steps

First, we subtract 15 from both sides of the equation:

$\frac{b}{3} + 15 - 15 = -8 - 15$

$\frac{b}{3} = -23$

Next, we multiply both sides of the equation by 3:

$3 \times \frac{b}{3} = 3 \times (-23)$

$b = -69$

3. Final Answer

$b = -69$