a×0.6=38.8
    a×0.6=30.8
    a×0.6=21.9
    （9381.34+X）*3.1%=4X
    a×0.6=16.8
    a×0.6=10.8
    90.245a^3-6a^2-6a-106=0
    90.245a^3-7a^2-7a-107=0
     x^2
    x^3-46.5x^2+46.5x-789=0
    (x-55.67)/x=20%
    (x-55.6)/x=20%
    (x-58.95)/x=20%
    (x-58.46)/x=20%
    (x-58.77)/x=20%
    (x-53.34)/x=20%
    (x-57.87)/x=20%
    (x-56.74)/x=20%
    (x-55.67)/x=20%
    128/y/y+y=0

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