Simplify (problem is in the picture)

Answer:
-2a+11b
Step-by-step explanation:
First, distribute 3 through the parenthesis:
6a+3b-4(-2b+2a)
now, distribute -4 through the parenthesis:
6a+3b+8b-8a
collect like terms:
-2a+3b+8b
collect like terms again, you'll get:
-2a+11b
let's simplify :
i hope it helped...