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(7)=2F+13
We move all terms to the left:
(7)-(2F+13)=0
We get rid of parentheses
-2F-13+7=0
We add all the numbers together, and all the variables
-2F-6=0
We move all terms containing F to the left, all other terms to the right
-2F=6
F=6/-2
F=-3
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