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(-3+F)=9+6F
We move all terms to the left:
(-3+F)-(9+6F)=0
We add all the numbers together, and all the variables
(F-3)-(6F+9)=0
We get rid of parentheses
F-6F-3-9=0
We add all the numbers together, and all the variables
-5F-12=0
We move all terms containing F to the left, all other terms to the right
-5F=12
F=12/-5
F=-2+2/5
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