-18=9+3(f-5)

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Solution for -18=9+3(f-5) equation: 



-18=9+3(f-5)

We move all terms to the left:

-18-(9+3(f-5))=0



We calculate terms in parentheses: -(9+3(f-5)), so:

9+3(f-5)

determiningTheFunctionDomain
3(f-5)+9

We multiply parentheses

3f-15+9

We add all the numbers together, and all the variables

3f-6

Back to the equation:

-(3f-6)



We get rid of parentheses

-3f+6-18=0

We add all the numbers together, and all the variables

-3f-12=0

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

-3f=12

f=12/-3

f=-4

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