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8n-15=2n+20-11
We move all terms to the left:
8n-15-(2n+20-11)=0
We add all the numbers together, and all the variables
8n-(2n+9)-15=0
We get rid of parentheses
8n-2n-9-15=0
We add all the numbers together, and all the variables
6n-24=0
We move all terms containing n to the left, all other terms to the right
6n=24
n=24/6
n=4
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