Answer:
i dunno this im in third grade
Step-by-step explanation:
6 (x+3)=12x-12
6x+18=12x-12
6x-12x=-18-12
-6x=-30
x=5
z = 8
3/4 (z+4)=9
3/4z + 3 = 9
3/4z = 6