F-(4f-7)=5f-(f+21)

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Solution for F-(4f-7)=5f-(f+21) equation: 



-(4F-7)=5F-(F+21)

We move all terms to the left:

-(4F-7)-(5F-(F+21))=0

We get rid of parentheses

-4F-(5F-(F+21))+7=0



We calculate terms in parentheses: -(5F-(F+21)), so:

5F-(F+21)

We get rid of parentheses

5F-F-21

We add all the numbers together, and all the variables

4F-21

Back to the equation:

-(4F-21)



We get rid of parentheses

-4F-4F+21+7=0

We add all the numbers together, and all the variables

-8F+28=0

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

-8F=-28

F=-28/-8

F=3+1/2

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