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7xy²-3xy²-9x²y+5x²y+11xy-7xy
4xy²-4x²y+4xy
4(xy²-x²y+xy ) A
=7xy²-9x²y+11xy+5x²y-7xy-3xy²
=7xy²-3xy²-9x²y+5x²y+11xy-7xy
=4xy²-4x²y+4xy
=4(xy²-x²y+xy)