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(F)=-12F+3
We move all terms to the left:
(F)-(-12F+3)=0
We get rid of parentheses
F+12F-3=0
We add all the numbers together, and all the variables
13F-3=0
We move all terms containing F to the left, all other terms to the right
13F=3
F=3/13
F=3/13
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