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(-3)=4F+9
We move all terms to the left:
(-3)-(4F+9)=0
We add all the numbers together, and all the variables
-(4F+9)-3=0
We get rid of parentheses
-4F-9-3=0
We add all the numbers together, and all the variables
-4F-12=0
We move all terms containing F to the left, all other terms to the right
-4F=12
F=12/-4
F=-3
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