Could someone answer this question for me?

the image is attached.

9 + -6 -6 : perform multiplication
Simplify - -3

We are given the expression: -3(-3 + 2) - 6

1.) The first step would be to distribute the -3 then leave the -6 at the end:
9 + (- 6) - 6

2.) Then simplify this from left to right: 
9 - 6 = 3
3 - 6 = -3

-3 is our final answer :)

Agc and bgd are vertical angles