-2ln(x)/x=0.1999982985
    2ln(x)/x=0.1999982985
    5x²-50x = 0
    50x²-50x=0
    -x^2+32x-272=0
    （25-x）+4x²=25²
    x（x-1）=42
    x*(1+7%)^3=2000
    （40-x）（20+2x）=1200
    60000*(1+20%)^n=95000
    1.2^x=1.58
    X*(1+18%)^2=75000
    X*(1+18%)^2+X=75000
    X*(1+18%)^2-X=75000
    40（1+x）²=48.4
    400（1-x）²=361
    (x+2)*2*0.5=9
    (1400-x)*(700-x)-800*(400-x)=0
    4.5*4-2x=6x
    1.5x-8=20%x+5

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