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(x² - x + 6y) - (2x² + 7x + 2y)
= x² - 2x² - x + 7x + 6y - 2y
= - x² + 6x + 4y
(2x² + 7x + 2y) + (x² - x + 6y)
= 2x² + x² +7x - x + 2y + 6y
= 3x² + 6x + 8y