84.1 = 32.654ln(x) - 1.3774
    50 = 32.654ln(x) - 1.3774
    （0.01-x）÷x（6-4×（0.01-x））＝2.1×10000000000000
    （0.01-x）÷x（6-4×（0.01-x））＝2.1×10000000000000
    84.1 = 33.428ln(x) - 3.6138
    50 = 33.428ln(x) - 3.6138
    84.1 = 34.025ln(x) - 4.2933
    50 = 34.025ln(x) - 4.2933
    x^3+2*x^2+3*x+4=0
    84.1 = 31.867ln(x) - 3.9173
    50 = 31.867ln(x) - 3.9173
    84.1 = 33.25ln(x) - 3.7198
    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

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