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-15-11f=-20f+12
We move all terms to the left:
-15-11f-(-20f+12)=0
We get rid of parentheses
-11f+20f-12-15=0
We add all the numbers together, and all the variables
9f-27=0
We move all terms containing f to the left, all other terms to the right
9f=27
f=27/9
f=3
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