3f+9=39

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Solution for 3f+9=39 equation: 



3f+9=39

We move all terms to the left:

3f+9-(39)=0

We add all the numbers together, and all the variables

3f-30=0

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

3f=30

f=30/3

f=10

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