15=f-12

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Solution for 15=f-12 equation: 



15=f-12

We move all terms to the left:

15-(f-12)=0

We get rid of parentheses

-f+12+15=0

We add all the numbers together, and all the variables

-1f+27=0

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

-f=-27

f=-27/-1

f=+27

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