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