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+12=3F-12
We move all terms to the left:
+12-(3F-12)=0
We get rid of parentheses
-3F+12+12=0
We add all the numbers together, and all the variables
-3F+24=0
We move all terms containing F to the left, all other terms to the right
-3F=-24
F=-24/-3
F=+8
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