13a
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13a
12a- 6a + a = 7a Since they all have the same variable, you can simply add and subtract 12-6 = 6 6+1 = 7
It is: 12a+2 when simplified
-24
First you find like terms so you subtract 12-9 Then you get 3a Your other like terms are 3+18 Then you get 21 So your answer is 3a+21