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