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(F)=15F-100
We move all terms to the left:
(F)-(15F-100)=0
We get rid of parentheses
F-15F+100=0
We add all the numbers together, and all the variables
-14F+100=0
We move all terms containing F to the left, all other terms to the right
-14F=-100
F=-100/-14
F=7+1/7
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