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(0)=9F+15
We move all terms to the left:
(0)-(9F+15)=0
We add all the numbers together, and all the variables
-(9F+15)=0
We get rid of parentheses
-9F-15=0
We move all terms containing F to the left, all other terms to the right
-9F=15
F=15/-9
F=-1+2/3
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