{-y-3(-3y+5)

To simplify the expression, we can start by removing the parentheses:

-y - 3(-3y + 5)

Distribute the negative sign to each term inside the parentheses:

-y - 3(-3y) - 3(5)

Simplify the doubled negatives:

-y + 9y - 15

Combine like terms:

(9y - y) - 15

Simplify further:

8y - 15

So the simplified expression is 8y - 15.