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-12f=13f-12
We move all terms to the left:
-12f-(13f-12)=0
We get rid of parentheses
-12f-13f+12=0
We add all the numbers together, and all the variables
-25f+12=0
We move all terms containing f to the left, all other terms to the right
-25f=-12
f=-12/-25
f=12/25
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