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15-1n=1n-1
We move all terms to the left:
15-1n-(1n-1)=0
We add all the numbers together, and all the variables
-1n-(n-1)+15=0
We get rid of parentheses
-1n-n+1+15=0
We add all the numbers together, and all the variables
-2n+16=0
We move all terms containing n to the left, all other terms to the right
-2n=-16
n=-16/-2
n=+8
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