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9f+12=3f+23
We move all terms to the left:
9f+12-(3f+23)=0
We get rid of parentheses
9f-3f-23+12=0
We add all the numbers together, and all the variables
6f-11=0
We move all terms containing f to the left, all other terms to the right
6f=11
f=11/6
f=1+5/6
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