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(F)=13F+3
We move all terms to the left:
(F)-(13F+3)=0
We get rid of parentheses
F-13F-3=0
We add all the numbers together, and all the variables
-12F-3=0
We move all terms containing F to the left, all other terms to the right
-12F=3
F=3/-12
F=-1/4
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