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-9f-(-12f)=6
We move all terms to the left:
-9f-(-12f)-(6)=0
We get rid of parentheses
-9f+12f-6=0
We add all the numbers together, and all the variables
3f-6=0
We move all terms containing f to the left, all other terms to the right
3f=6
f=6/3
f=2
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