4a+8a-a-12a=-7

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Solution for 4a+8a-a-12a=-7 equation: 



4a+8a-a-12a=-7

We move all terms to the left:

4a+8a-a-12a-(-7)=0

We add all the numbers together, and all the variables

-1a+7=0

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

-a=-7

a=-7/-1

a=+7

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