3+6f=21

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Solution for 3+6f=21 equation: 



3+6f=21

We move all terms to the left:

3+6f-(21)=0

We add all the numbers together, and all the variables

6f-18=0

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

6f=18

f=18/6

f=3

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