9f+4=31

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Solution for 9f+4=31 equation: 



9f+4=31

We move all terms to the left:

9f+4-(31)=0

We add all the numbers together, and all the variables

9f-27=0

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

9f=27

f=27/9

f=3

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