21=5f+1

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Solution for 21=5f+1 equation: 



21=5f+1

We move all terms to the left:

21-(5f+1)=0

We get rid of parentheses

-5f-1+21=0

We add all the numbers together, and all the variables

-5f+20=0

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

-5f=-20

f=-20/-5

f=+4

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