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(F+9)=7F-4
We move all terms to the left:
(F+9)-(7F-4)=0
We get rid of parentheses
F-7F+9+4=0
We add all the numbers together, and all the variables
-6F+13=0
We move all terms containing F to the left, all other terms to the right
-6F=-13
F=-13/-6
F=2+1/6
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