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(F)=-5F+12
We move all terms to the left:
(F)-(-5F+12)=0
We get rid of parentheses
F+5F-12=0
We add all the numbers together, and all the variables
6F-12=0
We move all terms containing F to the left, all other terms to the right
6F=12
F=12/6
F=2
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