2f+7=21

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Solution for 2f+7=21 equation: 



2f+7=21

We move all terms to the left:

2f+7-(21)=0

We add all the numbers together, and all the variables

2f-14=0

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

2f=14

f=14/2

f=7

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