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(F)=12F+9
We move all terms to the left:
(F)-(12F+9)=0
We get rid of parentheses
F-12F-9=0
We add all the numbers together, and all the variables
-11F-9=0
We move all terms containing F to the left, all other terms to the right
-11F=9
F=9/-11
F=-9/11
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