I'm suppose to simplify:

Question

-(3x-y)+3(2y-3x)

my answer is:
7y+12x

Is that right? I get lost with whether to use + or - sometimes.

Answer 1

-3x + y + 6 y - 9 x

-12 x + 7 y

Answer 2

-(3x-y) +3(2y-3x)

-3x + y + 6y + -9x

7y + -12x

As Damon said.