(1)75%x=72
x=96
(2)2x=2/3-1/2
2x=1/6
x=1/12
(3)-1/8x=3/5-1
-1/8x=-2/5
x=16/5
(4)20%x+60%x=8/25
80%x=8/25
x= 0.4