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15+n=n-5n
We move all terms to the left:
15+n-(n-5n)=0
We add all the numbers together, and all the variables
n-(-4n)+15=0
We get rid of parentheses
n+4n+15=0
We add all the numbers together, and all the variables
5n+15=0
We move all terms containing n to the left, all other terms to the right
5n=-15
n=-15/5
n=-3
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