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It is: 12a+2 when simplified
-24
13a
It multiplies out as: 12a-12+2 = 12a-10
17a
12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b
12a + a - 3a = 10a
12*a+8 =12a+8
18
That depends what the value of a is.
a2 + 12a + 27 = (a + 3)(a + 9)