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15=2n+23
We move all terms to the left:
15-(2n+23)=0
We get rid of parentheses
-2n-23+15=0
We add all the numbers together, and all the variables
-2n-8=0
We move all terms containing n to the left, all other terms to the right
-2n=8
n=8/-2
n=-4
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