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(3)=3F-4
We move all terms to the left:
(3)-(3F-4)=0
We get rid of parentheses
-3F+4+3=0
We add all the numbers together, and all the variables
-3F+7=0
We move all terms containing F to the left, all other terms to the right
-3F=-7
F=-7/-3
F=2+1/3
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