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(9)=2F-5
We move all terms to the left:
(9)-(2F-5)=0
We get rid of parentheses
-2F+5+9=0
We add all the numbers together, and all the variables
-2F+14=0
We move all terms containing F to the left, all other terms to the right
-2F=-14
F=-14/-2
F=+7
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