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15n+23=8n+100
We move all terms to the left:
15n+23-(8n+100)=0
We get rid of parentheses
15n-8n-100+23=0
We add all the numbers together, and all the variables
7n-77=0
We move all terms containing n to the left, all other terms to the right
7n=77
n=77/7
n=11
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