x-210+20%x/210-20%x=3/2

问题描述:

x-210+20%x/210-20%x=3/2

x-210+0.2x/210-0.2x=3/2
x(1+0.2/210-0.2)=210+3/2
x*(1+1/1050-1/5)=4203/2
x*(1031/1050)=4203/2