-3+-15=-a

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Solution for -3+-15=-a equation: 



-3+-15=-a

We move all terms to the left:

-3+-15-(-a)=0

We add all the numbers together, and all the variables

-(-1a)-3-15+=0

We add all the numbers together, and all the variables

-(-1a)=0

We get rid of parentheses

a=0

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