12*a+8
=12a+8
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As written, that equals 32a - 8, which factors to 8(4a - 1) If you meant 20a^2 + 12a - 8, that factors to 4(5a - 2)(a + 1)
12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b
12a + a - 3a = 10a
18
6(2a plus b)