-6=a+a

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Solution for -6=a+a equation: 



-6=a+a

We move all terms to the left:

-6-(a+a)=0

We add all the numbers together, and all the variables

-(+2a)-6=0

We get rid of parentheses

-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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