21+2f=5f

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Solution for 21+2f=5f equation: 



21+2f=5f

We move all terms to the left:

21+2f-(5f)=0

We add all the numbers together, and all the variables

-3f+21=0

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

-3f=-21

f=-21/-3

f=+7

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