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= -2x - 2y
2. 9x² + 7x³ - 8x² - 5x² = 7x³ + 9x² - 8x² - 5x²
= 7x³ - 4x²
3. 7a (1+b) - 3b (1+a) = 7a + 7ab - 3b -3ab
= 7ab-3ab + 7a - 3b
= 4ab + 7a - 3b