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12=f/3+11
We move all terms to the left:
12-(f/3+11)=0
We get rid of parentheses
-f/3-11+12=0
We multiply all the terms by the denominator
-f-11*3+12*3=0
We add all the numbers together, and all the variables
-1f+3=0
We move all terms containing f to the left, all other terms to the right
-f=-3
f=-3/-1
f=+3
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