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(F-3)=9F-6
We move all terms to the left:
(F-3)-(9F-6)=0
We get rid of parentheses
F-9F-3+6=0
We add all the numbers together, and all the variables
-8F+3=0
We move all terms containing F to the left, all other terms to the right
-8F=-3
F=-3/-8
F=3/8
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