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(F)=15^2-11F
We move all terms to the left:
(F)-(15^2-11F)=0
We get rid of parentheses
F+11F-15^2=0
We add all the numbers together, and all the variables
12F-225=0
We move all terms containing F to the left, all other terms to the right
12F=225
F=225/12
F=18+3/4
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