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(F)=-2F+5=13
We move all terms to the left:
(F)-(-2F+5)=0
We get rid of parentheses
F+2F-5=0
We add all the numbers together, and all the variables
3F-5=0
We move all terms containing F to the left, all other terms to the right
3F=5
F=5/3
F=1+2/3
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