a (2a + 7), 2a2 + 7a, 2a2 + 14, 2a2 + 7, -7m (p - 3mn), -7mp - 21mn, -7mp + 21m2n, 7mp - 21m2n, 2h (3k - 2h), 6hk - 4h2 , 6hk + 4h2, 5hk - 4h2 , (h - 2) (2h + 5), 2h2 - h - 10, 2h2 + h - 10, 2h2 + 9h -10, 2 (2 - t) (4t + 3), 8t 2+ 22t + 12, 8t2 - 10t + 12, -8t2 + 10t + 12, (8a - 2b) 2 , 64a2 + 4b2 , 32a2 + 8ab - b2 , 64a2 - 32ab + 4b2.

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