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+1=3F+13
We move all terms to the left:
+1-(3F+13)=0
We get rid of parentheses
-3F-13+1=0
We add all the numbers together, and all the variables
-3F-12=0
We move all terms containing F to the left, all other terms to the right
-3F=12
F=12/-3
F=-4
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