-12-f=f

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Solution for -12-f=f equation: 



-12-f=f

We move all terms to the left:

-12-f-(f)=0

We add all the numbers together, and all the variables

-2f-12=0

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

-2f=12

f=12/-2

f=-6

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