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(F+6)=4F-6
We move all terms to the left:
(F+6)-(4F-6)=0
We get rid of parentheses
F-4F+6+6=0
We add all the numbers together, and all the variables
-3F+12=0
We move all terms containing F to the left, all other terms to the right
-3F=-12
F=-12/-3
F=+4
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