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12=f/3+9
We move all terms to the left:
12-(f/3+9)=0
We get rid of parentheses
-f/3-9+12=0
We multiply all the terms by the denominator
-f-9*3+12*3=0
We add all the numbers together, and all the variables
-1f+9=0
We move all terms containing f to the left, all other terms to the right
-f=-9
f=-9/-1
f=+9
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