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= - 2p + q + 7r
b) 8x² + 6x² + 4x - 14x - 21 + 7
= 14x² - 10x - 14
c) 6a - 12a + 10b + 8b + 6 + 24
= - 6a + 18b + 30
d) 8x² + 12x² - 12x + 6x + 20 - 21
= 20x² - 6x - 1