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-15n=n-4n
We move all terms to the left:
-15n-(n-4n)=0
We add all the numbers together, and all the variables
-15n-(-3n)=0
We get rid of parentheses
-15n+3n=0
We add all the numbers together, and all the variables
-12n=0
n=0/-12
n=0
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