3x-1.5=6
3x=6+1.5
3x=7.5
x=2.5
x+3.7=6
x=6-3.7
x=2.3
7.2+2x=10
2x=10-7.2
2x=2.8
x=1.4
x-2.3=10.7
x=10.7+2.3
x=13
6x-2.8x=32
3.2x=32
x=10
x/15=41
x=41*15
x=615