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9f=6f-6
We move all terms to the left:
9f-(6f-6)=0
We get rid of parentheses
9f-6f+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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