3.2(5x-1)=3.6x-9.4
16x-3.2=3.6x-9.4
16x-3.6x=3.2-9.4
12.4x=-6.2
x=-0.5
8(0.7x-4)-2(0.2x-3)=-39
5.6x-32-0.4x+6=-39
5.2x=-13
x=-2.5
-3(2.1z-4)-4.2=1.2(-5z+0.5)
-6.3z+12-4.2=-6z+0.6
-0.3z=-7.2
z=24
6.4(2-3y)=6(0.8y-1)+6.8
12.8-19.2y=4.8y+0.8
24y=12
y=0.5