-30-15=a

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Solution for -30-15=a equation: 



-30-15=a

We move all terms to the left:

-30-15-(a)=0

We add all the numbers together, and all the variables

-1a-45=0

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

-a=45

a=45/-1

a=-45

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