-a-9=-7

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Solution for -a-9=-7 equation: 



-a-9=-7

We move all terms to the left:

-a-9-(-7)=0

We add all the numbers together, and all the variables

-1a-2=0

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

-a=2

a=2/-1

a=-2

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