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(F)=3F+13
We move all terms to the left:
(F)-(3F+13)=0
We get rid of parentheses
F-3F-13=0
We add all the numbers together, and all the variables
-2F-13=0
We move all terms containing F to the left, all other terms to the right
-2F=13
F=13/-2
F=-6+1/2
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