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6+7f=8f-1
We move all terms to the left:
6+7f-(8f-1)=0
We get rid of parentheses
7f-8f+1+6=0
We add all the numbers together, and all the variables
-1f+7=0
We move all terms containing f to the left, all other terms to the right
-f=-7
f=-7/-1
f=+7
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