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-12=3F+18
We move all terms to the left:
-12-(3F+18)=0
We get rid of parentheses
-3F-18-12=0
We add all the numbers together, and all the variables
-3F-30=0
We move all terms containing F to the left, all other terms to the right
-3F=30
F=30/-3
F=-10
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