12f-4f=21

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Solution for 12f-4f=21 equation: 



12f-4f=21

We move all terms to the left:

12f-4f-(21)=0

We add all the numbers together, and all the variables

8f-21=0

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

8f=21

f=21/8

f=2+5/8

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