x-140-(x-140)*40%=1/5x方程怎么做?
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x-140-(x-140)*40%=1/5x方程怎么做?
x-140-(x-140)*40%=1/5x
x-140-0.4x+56=0.2x
x-0.4x-0.2x=140-56
0.4x=84
x=210
x-140-0.4x+56=0.2x
x-0.4x-0.2x=140-56
0.4x=84
x=210