-3a-15=6

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Solution for -3a-15=6 equation: 



-3a-15=6

We move all terms to the left:

-3a-15-(6)=0

We add all the numbers together, and all the variables

-3a-21=0

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

-3a=21

a=21/-3

a=-7

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