11=7(f-3))+21

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Solution for 11=7(f-3))+21 equation: 



11=7(f-3))+21

We move all terms to the left:

11-(7(f-3))+21)=0

We add all the numbers together, and all the variables

-(7(f-3))=0



We calculate terms in parentheses: -(7(f-3)), so:

7(f-3)

We multiply parentheses

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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