-2a-a-6=9

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Solution for -2a-a-6=9 equation: 



-2a-a-6=9

We move all terms to the left:

-2a-a-6-(9)=0

We add all the numbers together, and all the variables

-3a-15=0

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

-3a=15

a=15/-3

a=-5

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