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-1+9f=3f+11
We move all terms to the left:
-1+9f-(3f+11)=0
We get rid of parentheses
9f-3f-11-1=0
We add all the numbers together, and all the variables
6f-12=0
We move all terms containing f to the left, all other terms to the right
6f=12
f=12/6
f=2
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