13. -3(y + 3) = 2y + 3

Explanation:

Step1: Expand the left - hand side

$-3(y + 3)=-3y-9$, so the equation becomes $-3y - 9=2y+3$.

Step2: Move the terms with $y$ to one side

Add $3y$ to both sides: $-3y+3y - 9=2y+3y + 3$, which simplifies to $-9 = 5y+3$.

Step3: Move the constant terms to one side

Subtract 3 from both sides: $-9 - 3=5y+3 - 3$, resulting in $-12 = 5y$.

Step4: Solve for $y$

Divide both sides by 5: $y=\frac{-12}{5}=-2.4$.

Answer:

$y = - 2.4$