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15-1-2n+5=n+3-n
We move all terms to the left:
15-1-2n+5-(n+3-n)=0
We add all the numbers together, and all the variables
-2n+15-1+5-3=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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