Solve for y

-9y-18=9 (y + 8)

y=-5

Step-by-step explanation:

1) Distribute 9 through the parenthesis: - 9y-18=9y+72

2) Move variable to the left side and change its sign: - 9y-9y-18=72

3) Move constant to the right side and change its sign: - 9y-9y=72+18

4) Collect the like terms and add the numbers: - 18y=90

5) Divide both sides of the equation by - 18: y=-5