((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
    x/（x+1000）=0.6
    x/（x+2000）=0.6
    x/(x+1000)=0.75
    x/(x+1000)=0.7
    x/(x+500)=0.2
    x/(x+500)=0.3
    x/(x+1000)=0.80

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