X²-6÷X
    x²+3x＝108
    3x+x^2=2160
    3x+x^2=2160
    2x^2-3x=2160
    56*0.29*(1-x^16)/(1-x)=2450
    56*0.29*(1-x^17)/(1-x)=2450
    56*(1-x^17)/(1-x)=2450
    56*(1-x^17)/(1-x)=2526
    -1.7=20*log(e^(-x))
    501*(1-x^17)/(1-x)=6340
    501*(1-x^17)/(1-x)=6340
    501*(1-x^17)/(1-x)=6340
    501*(1-x^17)/(1-x)=6340
    501*(1-x^17)/(1-x)=6340
    -1.7=20*log(e^(-x))
    (1-e^（-x）)/x=0.0822
    (1-e^（-x）)/x=-0.0822
    n（n+2）=0.677132
    lnx＋x＝-1

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