-31=f-9

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Solution for -31=f-9 equation: 



-31=f-9

We move all terms to the left:

-31-(f-9)=0

We get rid of parentheses

-f+9-31=0

We add all the numbers together, and all the variables

-1f-22=0

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

-f=22

f=22/-1

f=-22

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