-2a-15=15

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Solution for -2a-15=15 equation: 



-2a-15=15

We move all terms to the left:

-2a-15-(15)=0

We add all the numbers together, and all the variables

-2a-30=0

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

-2a=30

a=30/-2

a=-15

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