-9-a=-15

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Solution for -9-a=-15 equation: 



-9-a=-15

We move all terms to the left:

-9-a-(-15)=0

We add all the numbers together, and all the variables

-1a+6=0

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

-a=-6

a=-6/-1

a=+6

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