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(F+9)=3F+3
We move all terms to the left:
(F+9)-(3F+3)=0
We get rid of parentheses
F-3F+9-3=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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