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(F+1)=2F-9
We move all terms to the left:
(F+1)-(2F-9)=0
We get rid of parentheses
F-2F+1+9=0
We add all the numbers together, and all the variables
-1F+10=0
We move all terms containing F to the left, all other terms to the right
-F=-10
F=-10/-1
F=+10
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