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(F+5)=3F-1
We move all terms to the left:
(F+5)-(3F-1)=0
We get rid of parentheses
F-3F+5+1=0
We add all the numbers together, and all the variables
-2F+6=0
We move all terms containing F to the left, all other terms to the right
-2F=-6
F=-6/-2
F=+3
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