-18=15+3(n-1)

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Solution for -18=15+3(n-1) equation: 



-18=15+3(n-1)

We move all terms to the left:

-18-(15+3(n-1))=0



We calculate terms in parentheses: -(15+3(n-1)), so:

15+3(n-1)

determiningTheFunctionDomain
3(n-1)+15

We multiply parentheses

3n-3+15

We add all the numbers together, and all the variables

3n+12

Back to the equation:

-(3n+12)



We get rid of parentheses

-3n-12-18=0

We add all the numbers together, and all the variables

-3n-30=0

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

-3n=30

n=30/-3

n=-10

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