21=f/4+19

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Solution for 21=f/4+19 equation: 



21=f/4+19

We move all terms to the left:

21-(f/4+19)=0

We get rid of parentheses

-f/4-19+21=0

We multiply all the terms by the denominator


-f-19*4+21*4=0

We add all the numbers together, and all the variables

-1f+8=0

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

-f=-8

f=-8/-1

f=+8

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