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11n-15=8n+18
We move all terms to the left:
11n-15-(8n+18)=0
We get rid of parentheses
11n-8n-18-15=0
We add all the numbers together, and all the variables
3n-33=0
We move all terms containing n to the left, all other terms to the right
3n=33
n=33/3
n=11
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