19x^2-54x-9=0
    -78.975+84.5/(1+（X/12*6)+0.325/(1+(x/12*13）=0
    120X*232*（20407.81-X）=442425.44
    x^2 - 58x + 351=0
    n*n+(-1/4*n)(-1/4*n)= 4
    n*n+(-1/4*n)^2=4
    x+(50/x)
    x^2-5.6x+7.6=0
    x²-3.5x-10=0
    a×0.6=14.2
    a×0.6=64
    a×0.6=63.9
    a×0.6=71.9
    a×0.6=60.9
    a×0.6=60.6
    a×0.6=48.6
    a×0.6=35.9
    a×0.6=20.9
    a×0.6=13.2
    a×0.6=48.9

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