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(0)=15F+5
We move all terms to the left:
(0)-(15F+5)=0
We add all the numbers together, and all the variables
-(15F+5)=0
We get rid of parentheses
-15F-5=0
We move all terms containing F to the left, all other terms to the right
-15F=5
F=5/-15
F=-1/3
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