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-3(f+12)=6
We move all terms to the left:
-3(f+12)-(6)=0
We multiply parentheses
-3f-36-6=0
We add all the numbers together, and all the variables
-3f-42=0
We move all terms containing f to the left, all other terms to the right
-3f=42
f=42/-3
f=-14
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