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-6f=-11f+20
We move all terms to the left:
-6f-(-11f+20)=0
We get rid of parentheses
-6f+11f-20=0
We add all the numbers together, and all the variables
5f-20=0
We move all terms containing f to the left, all other terms to the right
5f=20
f=20/5
f=4
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