207.38-207.38*[1-(x+1000)/62000]*0.75=239.8

207.38*[1-(x+1000)/62000]*0.75=207.38-239.8=-32.42
=>1-(x+1000)/62000=-32.42/(207.38*0.75)=-0.2084
=>(x+1000)/62000=1.2084
=>x+1000=74923.39
=>x=73923.39

将方程左右移项,变形得:
1-(x+1000)/62000=(239.8-207.38)/(-207.38*0.75)

所以
(x+1000)/62000=1-(239.8-207.38)/(-207.38*0.75)

x=62000*(1-(239.8-207.38)/(-207.38*0.75))-1000=73923.39345