64x-4x*x=120
    64x-4x*x=120
    4x*x-64x+120=0
    4x*x-64x+120=0
    4x*x-64x+120=0
    4x*x-64x+120=0
    4x*x-64x+120=0
    4x*x-64x+120=0
    4x*x-64x+120=0
    4x*x-64x+120=0
    x*x-16x+30=0
    x*x-7.5x+9=0
    x*x-20x+101=0
    x*x-20+96=0
    6x+6x+30=x*x+5x
    4.5x^2-80x-18=0
    4.5x^2-80x-18=0
    4.5x^2-80x-18=0
    v
    76.5k÷0.85

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