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
    a×0.6=34.9
    a×0.6=19.9
    a×0.6=12.9
    6.5=x/(x-12)
    (587+x)*0.75*1*1.55=8700/5

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