x3y2 + 7x2y3 + 7xy - 2 + x2y3 + 8x3y2 - 3xy - 7 =
9x3y2 + 8x2y3 + 4xy - 9 =
xy ( 9x2y + 8xy2 + 4) - 9 =
xy ( xy(9x + 8y) + 4) - 9 .
This is still messy, but it's simpler than the octonomial in the question,
and we can't see any more that can be done with it.
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