21=f/19

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Solution for 21=f/19 equation: 



21=f/19

We move all terms to the left:

21-(f/19)=0

We add all the numbers together, and all the variables

-(+f/19)+21=0

We get rid of parentheses

-f/19+21=0

We multiply all the terms by the denominator


-f+21*19=0

We add all the numbers together, and all the variables

-1f+399=0

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

-f=-399

f=-399/-1

f=+399

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