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(F+8)=8F+9
We move all terms to the left:
(F+8)-(8F+9)=0
We get rid of parentheses
F-8F+8-9=0
We add all the numbers together, and all the variables
-7F-1=0
We move all terms containing F to the left, all other terms to the right
-7F=1
F=1/-7
F=-1/7
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