-2a+12+7a=-18

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Solution for -2a+12+7a=-18 equation: 



-2a+12+7a=-18

We move all terms to the left:

-2a+12+7a-(-18)=0

We add all the numbers together, and all the variables

5a+30=0

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

5a=-30

a=-30/5

a=-6

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