153.8×7.95+12.5x=8×（153.8+x）
    -2x+2=1/2x²+1/2x-2
    (9.82*10^4)/(0.5+x)=9810*x+9.81*10^4
    (9.82*10^4)/(0.5+x)=9810*x
    (2*9.81*10^4)/(0.5+x)= 9810*6x
    2.47x/(1+1.47x)=0.4
    sin(sqrt(2.1)x+x^3)/(ln(x^2-2))+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x^3)/(ln(x^2)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x^3)/(ln(x^2.857)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x)/(ln(x^2.857)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x)/(ln(x^2)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x)/(ln(x^2.857)-2)+e^x=tan(x)^2-7*sqrt(x)
    sin(sqrt(2.1)*x+x^3)/(ln(x^2.857)-e^2)+e^x=tan(x)^2-7*sqrt(x)
    (6x^2-x^4)/9
    sin(x)=ln(x)
    x^1341=222
    2x^2-x=1
    （1/x-2）-3x
    0.0000287/0.0000187=0.0833^x/0.0417x
    -6x^3-13x^2-12x-3

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