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3n-7=3n-4-3
We move all terms to the left:
3n-7-(3n-4-3)=0
We add all the numbers together, and all the variables
3n-(3n-7)-7=0
We get rid of parentheses
3n-3n+7-7=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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