21=7f+5f

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Solution for 21=7f+5f equation: 



21=7f+5f

We move all terms to the left:

21-(7f+5f)=0

We add all the numbers together, and all the variables

-(+12f)+21=0

We get rid of parentheses

-12f+21=0

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

-12f=-21

f=-21/-12

f=1+3/4

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