-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-24=0

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

-a=24

a=24/-1

a=-24

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