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(F)=-12F-7
We move all terms to the left:
(F)-(-12F-7)=0
We get rid of parentheses
F+12F+7=0
We add all the numbers together, and all the variables
13F+7=0
We move all terms containing F to the left, all other terms to the right
13F=-7
F=-7/13
F=-7/13
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