50 = 33.25ln(x) - 3.7198
    -7 + 12x - 10 - 29x = -21 + 15x
    x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)-{x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)}*0.16=3600
    x-(x/1.01*0.01)-[{(x-(x/1.01*0.01)*0.8)-(x/1.01*0.01*0.07/2)}*0.2]=3600
    x-(x/1.01*0.01)-{(x-(x/1.01*0.01)*0.8)-(x/1.01*0.01*0.07/2)}*0.2=3600
    x-(x/1.01*0.01)-(x/1.01*0.01*0.8-(x/1.01*0.01*0.07/2)*0.2)=4000
    42+1000/3/x+230/(1/6*9*x)=1.2*126
    42+1000/3/x+230/(1/6*3*x^2)=1.2*126
    1000/3/x+460/x^2=109
    0.15x^2+1.2x+1=0
    （2+10x）/(x+1)=9.65
    (59-X)/59*100%
    （59-X）/59*100%
    20*(1+i)^3=21.5
    20*（1+i）^3=21.5
    （38.584+x）×2.05＝38.584+67.968-x
    （38.584+x）×2.2＝38.584+67.968-x
    （38.584+x）×2.35＝38.584+67.968-x
    （38.584+x）×2.5＝38.584+67.968-x
    （38.584+x）×2.5＝38.584+68.468-x

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