1.094=-1/x*ln(1-x)
    1.046=-1/x*ln(1-x)
    1.057=-1/x*ln(1-x)
    -1.02=(1/x)*ln(1-x)
    x=720*1920*9/58880
    720*1920/x=300-（x-6240）*1920/x
    （1+x）/x
    X/(11.02+X)=15%
    X/11.02+X=15%
    X/131-(100-X)/1000=0.381
    7.94 = 1137.2*e(-343x)
    7.94 = 1137.2*e(-343)x
    7.94=1137.2*e-343x
    x*x-19x/22-28/22=0
    x^e=e^x
    x+7.81*x^0.4=26.05
    x*x-19x/22-0.04=0
    2[1-1/3x+((1+x)/9)]=x-(10-3x)/6
    e3+x=2
    1-1/3(x-(1+x)/3)=1/2(2x-(10-3x)/3)

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