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(a + 9)(a - 3)
36a2 - 60a + 25 = 36a2 - 30a - 30a + 25 = 6a(6a - 5) - 5(6a - 5) = (6a - 5)(6a - 5) = (6a - 5)2
(7a - 1)(6a + 1)
6a
98a + 5 + 6a = 104a + 5