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(F)=-5F+13
We move all terms to the left:
(F)-(-5F+13)=0
We get rid of parentheses
F+5F-13=0
We add all the numbers together, and all the variables
6F-13=0
We move all terms containing F to the left, all other terms to the right
6F=13
F=13/6
F=2+1/6
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