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(F)=9F-7
We move all terms to the left:
(F)-(9F-7)=0
We get rid of parentheses
F-9F+7=0
We add all the numbers together, and all the variables
-8F+7=0
We move all terms containing F to the left, all other terms to the right
-8F=-7
F=-7/-8
F=7/8
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