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    x^-2x+9=0
    x^2-72x-352=0
    (16+2x)^2
    x^(1/x)=(x-2)^2
    x^(1/x)=x+1/x-1
    x^2+x=420
    x×x×x-10^(-12)×x×x=10^(-10)×x+10^(-21)
    x^2-25x+150=0
    x^(1/x)=(x-1)^2
    (1/18)*x^2-2x-45/2=0
    0.2+aretan(31.825)*0.2/3.14=
    0.2+aretan(31.825)*0.2/3.14
    x^2+25.3x-700
    x^2-15x+100
    (x+1)(600-20x)=2600
    12.825x^2-110.6x+221.2
    12.825x^2-55.3x+55.3
    51.3x^2-221.2x+110.6
    51.3x^2-55.3x+13.825
    1110=x(x+39.99)

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