3f+7=28

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Solution for 3f+7=28 equation: 



3f+7=28

We move all terms to the left:

3f+7-(28)=0

We add all the numbers together, and all the variables

3f-21=0

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

3f=21

f=21/3

f=7

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