4=f/5-21

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Solution for 4=f/5-21 equation: 



4=f/5-21

We move all terms to the left:

4-(f/5-21)=0

We get rid of parentheses

-f/5+21+4=0

We multiply all the terms by the denominator


-f+21*5+4*5=0

We add all the numbers together, and all the variables

-1f+125=0

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

-f=-125

f=-125/-1

f=+125

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