15=18+(-a)

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Solution for 15=18+(-a) equation: 



15=18+(-a)

We move all terms to the left:

15-(18+(-a))=0

We add all the numbers together, and all the variables

-(18+(-1a))+15=0



We calculate terms in parentheses: -(18+(-1a)), so:

18+(-1a)

determiningTheFunctionDomain
(-1a)+18

We get rid of parentheses

-1a+18

Back to the equation:

-(-1a+18)



We get rid of parentheses

1a-18+15=0

We add all the numbers together, and all the variables

a-3=0

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

a=3

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