Add: xy² + 4x?y - 7x²y
3xy2 + 3
and xy + xy
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xy sq+ 4x sq y - 7x sq y - 3 xy sq + 3
0. + x sq y. + 0. - xy sq. +0
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xy sq + 5 x sq y - 7x sq y - 4x y sq + 3
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