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(10)=F-9
We move all terms to the left:
(10)-(F-9)=0
We get rid of parentheses
-F+9+10=0
We add all the numbers together, and all the variables
-1F+19=0
We move all terms containing F to the left, all other terms to the right
-F=-19
F=-19/-1
F=+19
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