Answer:
12x-3y-5
Step-by-step explanation:
3y-6y=-3y
4-9=-5
12x - 3y - 5
12x + 3y + 4 - 6y - 9 | Given
12x - 3y + 4 - 9 | Subtract 6y from 3y. It becomes -3y.
12x - 3y - 5 | Add +4 and -9 to get -5.
