4=31-3f

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Solution for 4=31-3f equation: 



4=31-3f

We move all terms to the left:

4-(31-3f)=0

We add all the numbers together, and all the variables

-(-3f+31)+4=0

We get rid of parentheses

3f-31+4=0

We add all the numbers together, and all the variables

3f-27=0

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

3f=27

f=27/3

f=9

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