31-2f=-11

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Solution for 31-2f=-11 equation: 



31-2f=-11

We move all terms to the left:

31-2f-(-11)=0

We add all the numbers together, and all the variables

-2f+42=0

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

-2f=-42

f=-42/-2

f=+21

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