21=f+1

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Solution for 21=f+1 equation: 



21=f+1

We move all terms to the left:

21-(f+1)=0

We get rid of parentheses

-f-1+21=0

We add all the numbers together, and all the variables

-1f+20=0

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

-f=-20

f=-20/-1

f=+20

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