-9=-(3f+18+12)

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Solution for -9=-(3f+18+12) equation: 



-9=-(3f+18+12)

We move all terms to the left:

-9-(-(3f+18+12))=0

We add all the numbers together, and all the variables

-(-(3f+30))-9=0



We calculate terms in parentheses: -(-(3f+30)), so:

-(3f+30)

We get rid of parentheses

-3f-30

Back to the equation:

-(-3f-30)



We get rid of parentheses

3f+30-9=0

We add all the numbers together, and all the variables

3f+21=0

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

3f=-21

f=-21/3

f=-7

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