将方程两边都除以10，(x-2)/2-(x+1)/5=0.3方程两边都乘以105x-10-2x-2=3x=5
(0.1x-0.2)/0.02-(x+1)/0.5=3(5x-10)-(2x+2)=33x-12=33x=15x=5
5x-20-50分之100（x+1）=3005x-20-2（x+1）=3005x-2x-2=300+203x=322x=3/322
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