-21=6+9(f-3)

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Solution for -21=6+9(f-3) equation: 



-21=6+9(f-3)

We move all terms to the left:

-21-(6+9(f-3))=0



We calculate terms in parentheses: -(6+9(f-3)), so:

6+9(f-3)

determiningTheFunctionDomain
9(f-3)+6

We multiply parentheses

9f-27+6

We add all the numbers together, and all the variables

9f-21

Back to the equation:

-(9f-21)



We get rid of parentheses

-9f+21-21=0

We add all the numbers together, and all the variables

-9f=0

f=0/-9

f=0

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