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