5xy - 4py = y(5x-4p)
7xy + 12xz = x(7y+12z)
5xyz + 20uxy = 5xy(z+4u)
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5xy - 4py = y(5x-4p)
7xy + 12xz = x(7y+12z)
5xyz + 20uxy = 5xy(z+4u)