5(x-8)=3x
4.2x-9=2.5x+2.9
9(2x-3)-2=5(2x-1)
(1)5x-40=3x
2x=40
x=20
(2)4.2x+2.5x=2.9+9
6.7x=11.9
x=119/67
(3)18x-27-2=10x-5
18x-10x=-5+27+2
8x=24
x=3