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-15=-7-8n
We move all terms to the left:
-15-(-7-8n)=0
We add all the numbers together, and all the variables
-(-8n-7)-15=0
We get rid of parentheses
8n+7-15=0
We add all the numbers together, and all the variables
8n-8=0
We move all terms containing n to the left, all other terms to the right
8n=8
n=8/8
n=1
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