31=3-4f

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Solution for 31=3-4f equation: 



31=3-4f

We move all terms to the left:

31-(3-4f)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4f-3+31=0

We add all the numbers together, and all the variables

4f+28=0

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

4f=-28

f=-28/4

f=-7

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