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86=8f+6
We move all terms to the left:
86-(8f+6)=0
We get rid of parentheses
-8f-6+86=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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