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