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-5n+4n=-13n
We move all terms to the left:
-5n+4n-(-13n)=0
We add all the numbers together, and all the variables
-1n-(-13n)=0
We get rid of parentheses
-1n+13n=0
We add all the numbers together, and all the variables
12n=0
n=0/12
n=0
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