(105-x)/(ln(90/(x-15))=121.0338552
    （105-x）/ln(90/(x-15)=121.0338552
    x^4-3x^2 = 1
    x^3-3x^2 = -1
    x^3-3x^2=1
    x^3-3x^2=2
    x/(0.95-x)=(1-x)^1.5/(1-0.95)^1.5
    x-sinx+lnx=0
    x-lnx-sinx=0
    x/(0.95-x)=(1-x)^1.5/(1-0.95)^2
    x^2=3
    sinx-lnx
    156x+265x^2/654=12.9
    x+x*0.25=125
    4^x-x^4
    3^x-x^3
    2^-x^2
    x-x*0.87=100
    x-x*0.87=70
    1.523=1/（2*x*√(1-x^2)）

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