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(F)=-1F+3
We move all terms to the left:
(F)-(-1F+3)=0
We get rid of parentheses
F+1F-3=0
We add all the numbers together, and all the variables
2F-3=0
We move all terms containing F to the left, all other terms to the right
2F=3
F=3/2
F=1+1/2
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