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    n*n+n-600=0
    x^2-27x+38=0
    x²+3x-1.36=0
    x^2+2x-392=0
    0.5x(x-1)=90
    x^2+2x-192=0
    0=3 X^2 -4 x+6
    x²+40x-1278=0
    x*1.81*1.3=2.49
    x*x+144=(18-x)*(18-x)
    12^x-9(4^x)-9(3^x)+18=0
    (x+30)(x+30)=xx+3600
    (x+30)(x+30)=3600
    xx-(x-30)(x-30)=3600
    x*x-60x=2700
    x*x-60x+900=3600
    xx-60x+900=3600
    x^3-(29/4)*x-6=0
    -3x^2+8x+13=0
    -3k^2+8k+13=0

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