Answer:
you use your biggest brain cell
Step-by-step explanation:
a and b
15x-60=120
15x-60-60=120-60
15x=60
15x/15=60/15
x=4
3x=12
3x/3=12/3
4.5
x>22
3(x+4)>18
3x+12> 54
3x>66
