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(2x + y) x² - 3xy + 5
⇔ 2x³ - 6x²y + 10x + x²y - 3xy² + 5y
⇔ 2x³ + 10x + 5y - 6x²y + x²y - 3xy²
⇔ 2x³ + 10x + 5y -5x²y - 3xy²