12=39-3f

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Solution for 12=39-3f equation: 



12=39-3f

We move all terms to the left:

12-(39-3f)=0

We add all the numbers together, and all the variables

-(-3f+39)+12=0

We get rid of parentheses

3f-39+12=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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