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= 6p² - 4p - 5 - 9p² - 3p + 4
= 6p² - 9p² - 4p - 3p - 5 + 4
= -3p² - 7p - 1 (B.)
= 9p² + 3p - 4 - 6p² + 4p + 5
= (9p² - 6p²) + (3p + 4p) + (-4 + 5)
= 3p² + 7p +1