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-3f=-9f+6
We move all terms to the left:
-3f-(-9f+6)=0
We get rid of parentheses
-3f+9f-6=0
We add all the numbers together, and all the variables
6f-6=0
We move all terms containing f to the left, all other terms to the right
6f=6
f=6/6
f=1
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