-a-a=6

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Solution for -a-a=6 equation: 



-a-a=6

We move all terms to the left:

-a-a-(6)=0

We add all the numbers together, and all the variables

-2a-6=0

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

-2a=6

a=6/-2

a=-3

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