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(12)=2F-6
We move all terms to the left:
(12)-(2F-6)=0
We get rid of parentheses
-2F+6+12=0
We add all the numbers together, and all the variables
-2F+18=0
We move all terms containing F to the left, all other terms to the right
-2F=-18
F=-18/-2
F=+9
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