50000/x+110000/(x+60)=850
    50000/x+120000/(x+60)=850
    40000/x+110000/(x+60)=750
    40000/x+80000/(x+60)=650
    40000/x+90000/(x+60)=650
    30000/x+80000/(x+60)=550
    30000/x+90000/(x+60)=550
    30000/x+60000/(x+60)=450
    20000/x+60000/(x+60)=350
    20000/x+50000/(x+60)=350
    16x*1.55=1.45x*18
    10000/x+50000/(x+60)=250
    10000/x+30000/(x+60)=150
    10000/x+30000/(x+60)=250
    20000/x+60000/(x+60)=250
    20000/x+50000/(x+60)=250
    20000/x+40000/(x+60)=250
    20000/x+30000/(x+60)=250
    10000/x+20000/(x+60)=150
    8000/(1.5+x)＝5000/x

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