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
    17.1x^2-159.40x-888.1=0
    -5.58x^2+183.0x-177.47=0
    -5.58x^2+183x+234.92=0
    26.05x^2-87.41x+261.41=0
    26.05x^2-87.41+x261.41=0
    26.05x^2-87.41+261.41=0
    -5.58x^2+183x+234.915=0
    5x=20
    7=(2*sqrt(2)-a)^2+(2*sqrt(2)-(2+sqrt(3))*a)^2

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