(x-215)/ln[135/(350-x)]=16.67x-4608.45
    4x^2/（0.1-x）（6-4x）＝10^（-12.36）
    e^x=sqrt(1-x^2)+1
    28x-100-x*x=0
    3.5x+x=9
    x^3+5*x^2+8*x+3=0
    8969359/500000*a^2-8421403/250000*a+3506099/500000=0
    (100-x)/[ln(160-x)/60]=78.95
    11*a^2-36*a+8=0
    10.5*a^2-53*a+12.25=0
    17*a^2-90*a+21=0
    33*a^2-62*a+13=0
    6*a^2-14*a+3=0
    2.25*a^2-11*a+2.5=0
    1032317/10000*a^2-1346967/2500*a+636991/5000=0
    196043/2500*a^2-258513/625*a+61002/625=0
    219*a^2-716*a+168=0
    45227/25*a^2-120932/25*a+26264/25=0
    45227/25*a^2-120932/25*a+26264/5=0
    98*a^2-392*a+98=0

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