15=4-(a+9)

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Solution for 15=4-(a+9) equation: 



15=4-(a+9)

We move all terms to the left:

15-(4-(a+9))=0



We calculate terms in parentheses: -(4-(a+9)), so:

4-(a+9)

determiningTheFunctionDomain
-(a+9)+4

We get rid of parentheses

-a-9+4

We add all the numbers together, and all the variables

-1a-5

Back to the equation:

-(-1a-5)



We get rid of parentheses

1a+5+15=0

We add all the numbers together, and all the variables

a+20=0

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

a=-20

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