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-2-9n=-7-8n
We move all terms to the left:
-2-9n-(-7-8n)=0
We add all the numbers together, and all the variables
-9n-(-8n-7)-2=0
We get rid of parentheses
-9n+8n+7-2=0
We add all the numbers together, and all the variables
-1n+5=0
We move all terms containing n to the left, all other terms to the right
-n=-5
n=-5/-1
n=+5
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