12=-7+f

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Solution for 12=-7+f equation: 



12=-7+f

We move all terms to the left:

12-(-7+f)=0

We add all the numbers together, and all the variables

-(f-7)+12=0

We get rid of parentheses

-f+7+12=0

We add all the numbers together, and all the variables

-1f+19=0

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

-f=-19

f=-19/-1

f=+19

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