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    3x+3x^2+2x^3=7911
    43x+3x^2+2x^3=7911
    7x-45=91x
    89+x=22
    x*3*1.31=3.99
    (1+x)^3-7x-1=0
    x*[1/x]
    x^2-3x+200
    x×x-3x+200
    x^2+(21-x)^2=15^2
    9-(4-x)=2
    54x^2+434x+222=0
    54x^2+434x+222=0
    54x^2+434x+222=0
    0.45x-7.5
    0.45x-7.5
    (-2x+120)(x-20)=600
    x^2-90x+1500=0
    6290.3×π×0.0046×(50-x)=87.4×0.32738×(x-38)
    1262=x+12(x-766)

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