x=346*x^(-0.125)-19.1*x^(0.15)
    X（130-X）＝3600
    X÷（X+572.738）=5%
    X÷（X+555.56）=3%
    2 * x - 2 * ( x - 1 ) ^ -3 + 2 * ( x - 1 ) ^ -2 =0
    7x/3.5=4
    7*x/3.5=4
    ((x+4)/7-5)*3=x
    x(x-2)=-3/16
    （121＋x)(300-2x)-10x-(300-2x)31=28200
    （121＋x)(300-2x)-10x-(300-2x)31
    2x+1/x²
    x×x-35x=-6345
    x×x-35x=-6345
    x×x-35x=-6345
    x×x-35x=-6345
    4a^3+27a^2=216
    1.512=1.1X+X
    x/(x+1000)=0.65
    x/（x+2000）=0.9

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