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(F-4)=3F-8
We move all terms to the left:
(F-4)-(3F-8)=0
We get rid of parentheses
F-3F-4+8=0
We add all the numbers together, and all the variables
-2F+4=0
We move all terms containing F to the left, all other terms to the right
-2F=-4
F=-4/-2
F=+2
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