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(F)=8F+3=3F+12
We move all terms to the left:
(F)-(8F+3)=0
We get rid of parentheses
F-8F-3=0
We add all the numbers together, and all the variables
-7F-3=0
We move all terms containing F to the left, all other terms to the right
-7F=3
F=3/-7
F=-3/7
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