(12=-7f-9.)

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Solution for \(12=-7f-9.\) equation: 



(12=-7f-9.)

We move all terms to the left:

(12-(-7f-9.))=0

We add all the numbers together, and all the variables

(12-(-7f-9))=0



We calculate terms in parentheses: +(12-(-7f-9)), so:

12-(-7f-9)

determiningTheFunctionDomain
-(-7f-9)+12

We get rid of parentheses

7f+9+12

We add all the numbers together, and all the variables

7f+21

Back to the equation:

+(7f+21)



We get rid of parentheses

7f+21=0

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

7f=-21

f=-21/7

f=-3

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