21=9f+2f

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Solution for 21=9f+2f equation: 



21=9f+2f

We move all terms to the left:

21-(9f+2f)=0

We add all the numbers together, and all the variables

-(+11f)+21=0

We get rid of parentheses

-11f+21=0

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

-11f=-21

f=-21/-11

f=1+10/11

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