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4n-5n=-n
We move all terms to the left:
4n-5n-(-n)=0
We add all the numbers together, and all the variables
4n-5n-(-1n)=0
We add all the numbers together, and all the variables
-1n-(-1n)=0
We get rid of parentheses
-1n+1n=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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