12-2f=-f

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Solution for 12-2f=-f equation: 



12-2f=-f

We move all terms to the left:

12-2f-(-f)=0

We add all the numbers together, and all the variables

-2f-(-1f)+12=0

We get rid of parentheses

-2f+1f+12=0

We add all the numbers together, and all the variables

-1f+12=0

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

-f=-12

f=-12/-1

f=+12

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