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=-4+6F
We move all terms to the left:
-(-4+6F)=0
We add all the numbers together, and all the variables
-(6F-4)=0
We get rid of parentheses
-6F+4=0
We move all terms containing F to the left, all other terms to the right
-6F=-4
F=-4/-6
F=2/3
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