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-9-10n=-8n+9
We move all terms to the left:
-9-10n-(-8n+9)=0
We get rid of parentheses
-10n+8n-9-9=0
We add all the numbers together, and all the variables
-2n-18=0
We move all terms containing n to the left, all other terms to the right
-2n=18
n=18/-2
n=-9
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