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= 8xy² - 5xy² + 4x - 2x - 4y - y + 3
= 3xy² + 2x - 5y + 3
= ( 8 - 5 ) xy² + ( 4 - 2 ) x + ( -4 -1 ) y + 3
= 3xy² + 2x - 5y + 3