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= 5a + 8a + 8 + 3
= 13a + 11
b. (8x² + 4x - 21) + (6x² - 14x + 7) = 8x² + 4x - 21 + 6x² - 14x + 7
= 8x² + 6x² + 4x - 14x - 21 + 7
= 14x² - 10x - 14