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(F)=15F-9
We move all terms to the left:
(F)-(15F-9)=0
We get rid of parentheses
F-15F+9=0
We add all the numbers together, and all the variables
-14F+9=0
We move all terms containing F to the left, all other terms to the right
-14F=-9
F=-9/-14
F=9/14
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