Chapter 2 - Solving Equations - 2-3 Solving Multi-Step Equations - Mixed Review - Page 100: 72

$y=-5$

We start with the given equation: $3y+5=-10$ We subtract $5$ from both sides of the equation: $3y+5-5=-5-10$ We combine like terms on both sides of the equation: $3y=-15$ We divide by $3$ on both sides of the equation: $y=\frac{-15}{3}=-5$