Answer:
It's C.
Step-by-step explanation:
12x+4+9x+8=180
Combine like terms 21x+12=180
Subtract 12 from both sides 21x=168
Divide each side by 21 21x/21=168/21
x=8
7x + 14 = 6x + 30
x + 14 = 30
x = 16
0
18 is the correct answer
