84.3 = 34.765ln(x) - 5.4445
    50 = 34.765ln(x) - 5.4445
    84.1 = 34.665ln(x) - 6.077
    50 = 34.665ln(x) - 6.077
    84.1 = 34.521ln(x) - 3.4132
    50 = 34.521ln(x) - 3.4132
    84.1 = 33.96ln(x) - 7.0756
    50 = 33.96ln(x) - 7.0756
    （440*34-x）*0.9+8*34=11428.08
    x+√(x+0.7)-√0.7=1.5
    84.1 = 35.395ln(x) - 7.3177
    50 = 35.395ln(x) - 7.3177
    23317.45=（480*63-x）*0.85
    610/1235=360X/[360*(X+0.10)]
    (100-x)*(60-2*x)=4750
    M*1/3/3100+M*0.8/3/1000+M*1.2/3/2200=1
    x^3-2.05x^2+0.0016x+0.1556=0
    x^3-2.05x^2+0.0016x+0.1756=0
    x^3-1.97x^2+0.0016x+0.1756=0
    (151+218.5)/31*x+279/31*(x+15)+124/31(x+30)=2670

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