.2x=3/5-x
2x+x=3/5
3x=3/5
x=3/5÷3
x=1/5
x+7/2=1/5x+11.5
x-1/5x=11.5-7/2
4/5x=4
x=4÷4/5
x=5
1/2x-41/10=1.5x-8.3
1.5x-1/2x=8.3-41/10
x=4.2