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