12+2a=-6

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Solution for 12+2a=-6 equation: 



12+2a=-6

We move all terms to the left:

12+2a-(-6)=0

We add all the numbers together, and all the variables

2a+18=0

We move all terms containing a to the left, all other terms to the right

2a=-18

a=-18/2

a=-9

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