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(F)=15-6F
We move all terms to the left:
(F)-(15-6F)=0
We add all the numbers together, and all the variables
F-(-6F+15)=0
We get rid of parentheses
F+6F-15=0
We add all the numbers together, and all the variables
7F-15=0
We move all terms containing F to the left, all other terms to the right
7F=15
F=15/7
F=2+1/7
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