88-7x=5x-20
108=12x
x=108/12
x=9
4(4x-11)=3(22-2x)
16x-44=66-6x
22x=110
x=5
9.4乘[1.28-(x-0.31)]=0.47
9.4*(1.59-x)=0.47
1.59-x=0.47/9.4
1.59-x=0.05
x=1.64