6x−12 - 6 ( x− 2), 4a2 + 8a - 4a (a + 2), 15b3 - 10 b2 - 5b2 (3b − 2),  9p (p − q) − 12q (p − q) - 3 (p - q) (3p - 4q), 4 x2 (3x + 2) - 2 (3x +2) - 2 (3x + 2) (2x2 - 1),

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