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12f+11=-9f+25
We move all terms to the left:
12f+11-(-9f+25)=0
We get rid of parentheses
12f+9f-25+11=0
We add all the numbers together, and all the variables
21f-14=0
We move all terms containing f to the left, all other terms to the right
21f=14
f=14/21
f=2/3
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