2x^3-3x^2+1=0
    5000+15x−120x^2=6000
    5000+15x−x×120x=6000
    （500-x）（10+0.05x）=6000
    (2*x-1)/3-3=(0.3*x+0.5)/0.2
    45*x+5*x=124
    （sqrt（x^2-10）+sqrt(10)）^2=4^2+(2+x)^2
    1/3+x/60+x/90=1
    -x3+x2-1
    x=67.5-x*0.66
    2x-1/x
    20(1+x)^2=24.2
    0.5(x^2-x)=28
    0.5(x^2-x)
    1/2*x(x-1)
    3000(1+x)^2=3630
    sinx=0.95x
    X+(X*0.03)=99
    X+(X*0.03)=35.5
    X+(X*0.09)=433.5

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