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