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(F)=3F-16=12
We move all terms to the left:
(F)-(3F-16)=0
We get rid of parentheses
F-3F+16=0
We add all the numbers together, and all the variables
-2F+16=0
We move all terms containing F to the left, all other terms to the right
-2F=-16
F=-16/-2
F=+8
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