3*f+1=21

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Solution for 3*f+1=21 equation: 



3f+1=21

We move all terms to the left:

3f+1-(21)=0

We add all the numbers together, and all the variables

3f-20=0

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

3f=20

f=20/3

f=6+2/3

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