15=a-(-4)

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Solution for 15=a-(-4) equation: 



15=a-(-4)

We move all terms to the left:

15-(a-(-4))=0



We calculate terms in parentheses: -(a-(-4)), so:

a-(-4)

We add all the numbers together, and all the variables

a+4

Back to the equation:

-(a+4)



We get rid of parentheses

-a-4+15=0

We add all the numbers together, and all the variables

-1a+11=0

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

-a=-11

a=-11/-1

a=+11

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