7+4f=21

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Solution for 7+4f=21 equation: 



7+4f=21

We move all terms to the left:

7+4f-(21)=0

We add all the numbers together, and all the variables

4f-14=0

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

4f=14

f=14/4

f=3+1/2

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