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(F)=2F-4
We move all terms to the left:
(F)-(2F-4)=0
We get rid of parentheses
F-2F+4=0
We add all the numbers together, and all the variables
-1F+4=0
We move all terms containing F to the left, all other terms to the right
-F=-4
F=-4/-1
F=+4
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