y（1+1/y）^30-y=66.4
    （1+x）^30-1=66.4x
    0.3y²－y＝0.8
    40/（x-40）=（x+15）/（2*x-15）
    10x²+2x=9
    x^3-x+0.1=0
    x^3-x-0.1=0
    x^3-x-0.5=0
    x^3-x+1=0
    x^3-x-1=0
    x^3-x-3=0
    x^2-x-3=0
    x^2-x-2=0
    x^2-x+2=0
    x^3-2*x-1=0
    x^2-4*x-1=0
    x^2-4*x-1=0
    x^2-2*x-4=0
    x^2-2*x-2=0
    x^2-2*x-1=0

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