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18-9n=-8n
We move all terms to the left:
18-9n-(-8n)=0
We get rid of parentheses
-9n+8n+18=0
We add all the numbers together, and all the variables
-1n+18=0
We move all terms containing n to the left, all other terms to the right
-n=-18
n=-18/-1
n=+18
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