21=-(3+8f)

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Solution for 21=-(3+8f) equation: 



21=-(3+8f)

We move all terms to the left:

21-(-(3+8f))=0

We add all the numbers together, and all the variables

-(-(8f+3))+21=0



We calculate terms in parentheses: -(-(8f+3)), so:

-(8f+3)

We get rid of parentheses

-8f-3

Back to the equation:

-(-8f-3)



We get rid of parentheses

8f+3+21=0

We add all the numbers together, and all the variables

8f+24=0

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

8f=-24

f=-24/8

f=-3

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