x²y-3xy²+2yx²-y²x

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x²y-3xy²+2yx²-y²xx²y-3xy²+2yx²-y²xx²y-3xy²+2yx

x²y-3xy²+2yx²-y²x
x²y-3xy²+2yx²-y²x

x²y-3xy²+2yx²-y²x
x²y-3xy²+2yx²-y²x
=3x²y-4xy²