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6(2x - 13) = 12x - 78
12x - 78 - (3x - 6) = 12x - 78 - 3x + 6
= 9x - 72
b. 3p² - 3p + 3 - (p² - 3p + 6) = 3p² - 3p + 3 - p² + 3p - 6
= 2p² - 3