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(F+3)=7F+4
We move all terms to the left:
(F+3)-(7F+4)=0
We get rid of parentheses
F-7F+3-4=0
We add all the numbers together, and all the variables
-6F-1=0
We move all terms containing F to the left, all other terms to the right
-6F=1
F=1/-6
F=-1/6
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