((4-x)^2)/((1+x)*(1+2*x/3)=0.25
    ln（-x）=x
    x^2+40x+13=0
    x^2-3x+13=0
    (e^x)*ln(x)-x^2=0
    ((164－x)➗x)=2.96％
    ((167－x)➗x)=2.96％
    3x+3.9(25-x)=83.1
    1.6×0.85× X=1.865
    6.47x^2+45.28x-167.51=0
    23.04x^2-24.12x+13.68=0
    -5.54x^2+58.2x-73.7=0
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.708
    0.28x²-68.4x+1254=0
    x/(450+x)=0.15
    X/（100+X）=0.2
    x*e^x-3
    17.1x^2-203.1x-720.3=0
    x*exp(x)-1
    x*exp(-x)-1

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