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6=3f-12
We move all terms to the left:
6-(3f-12)=0
We get rid of parentheses
-3f+12+6=0
We add all the numbers together, and all the variables
-3f+18=0
We move all terms containing f to the left, all other terms to the right
-3f=-18
f=-18/-3
f=+6
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