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(F)=8F-640
We move all terms to the left:
(F)-(8F-640)=0
We get rid of parentheses
F-8F+640=0
We add all the numbers together, and all the variables
-7F+640=0
We move all terms containing F to the left, all other terms to the right
-7F=-640
F=-640/-7
F=91+3/7
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