ln(0.183*0.05/x+0.187)=4.757/0.183
    2400+(64-n)(90+1.5n)=8142
    (85)/(184+x)=0.2
    (85+x)/(184+x)=0.2
    3Q2-40Q+100=0
    （x-800）×0.8+800=1760
    30000/x+40000/(x+60)=350
    50000/x+60000/(x+60)=650
    50000/x+70000/(x+60)=650
    40000/x+60000/(x+60)=550
    30000/x+50000/(x+60)=450
    30000/x+30000/(x+60)=350
    40000/x+120000/(x+60)=850
    40000/x+100000/(x+60)=750
    30000/x+90000/(x+60)=650
    30000/x+70000/(x+60)=550
    20000/x+60000/(x+60)=450
    20000/x+40000/(x+60)=350
    x/0.12-x=76230
    10000/x+40000/(x+60)=250

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