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= (2x×3x²)+(2x×(-9xy))+(2x×2y²)+((-3y)×3x²)+((-3y)×(-9xy))+((-3y)×2y²)
= 6x³-18x²y+4xy²-9x²y+27xy²-6y³
= 6x³-27x²y+31xy²-6y³