3f=21f+21

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Solution for 3f=21f+21 equation: 



3f=21f+21

We move all terms to the left:

3f-(21f+21)=0

We get rid of parentheses

3f-21f-21=0

We add all the numbers together, and all the variables

-18f-21=0

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

-18f=21

f=21/-18

f=-1+1/6

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