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8(8+n)-8(n-1)=72
We move all terms to the left:
8(8+n)-8(n-1)-(72)=0
We add all the numbers together, and all the variables
8(n+8)-8(n-1)-72=0
We multiply parentheses
8n-8n+64+8-72=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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