7f+10=31

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Solution for 7f+10=31 equation: 



7f+10=31

We move all terms to the left:

7f+10-(31)=0

We add all the numbers together, and all the variables

7f-21=0

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

7f=21

f=21/7

f=3

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