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3=f/3-1
We move all terms to the left:
3-(f/3-1)=0
We get rid of parentheses
-f/3+1+3=0
We multiply all the terms by the denominator
-f+1*3+3*3=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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