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