4.2-0.6x=3.6x
4.2=4.2x
x=1
5x+2x=33.6
7x=33.6
x=4.8
7x-4x=0.75
3x=0.75
x=0.25
2x+7x+2.1=12
9x=14.1
x=14.19
56x-32x-119=361
24x=480
x=20
x+5=2x
5=x
4x-28=2x
2x=28
x=14
2x+18=7x
18=5x
x=85
5x=25*4-15x
20x=100
x=5
7x-x+2*3=29.4
6x+6=29.4
6x=23.4
x=23.46
(28.8+5.5x+3.2）除2=71
14.4+2.25x+1.6=71
2.25x=55
x=552.25