5（8-x)=17.5
40-5x=17.5
-5x=17.5-40
5x=22.5
x=4.5
(x+7.3)=3.5
x=3.5-7.3
x=-3.8
1.4(x+3.2)=6.3
x+3.2=4.5
x=1.3
26x+8x=5.1
34x=5.1
x=0.15
x-0.24x=22.8
0.76x=22.8
x=30
4.8x-x=19
3.8x=19
x=5