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