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9f-41=f+39
We move all terms to the left:
9f-41-(f+39)=0
We get rid of parentheses
9f-f-39-41=0
We add all the numbers together, and all the variables
8f-80=0
We move all terms containing f to the left, all other terms to the right
8f=80
f=80/8
f=10
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