5*3-x/2=8
15-x/2=8
x/2=7
x=14
0.273/x=0.35
0.35x=0.273
x=0.78
1.8x=0.972
x=0.54
x/0.756=90
x=68.04
9x-40=5
9x=45
x=5
x/5+9=21
x/5=12
x=60
48=27+5x
5x=48-27
5x=21
x=4.2