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-9n-3=-18-11n+n
We move all terms to the left:
-9n-3-(-18-11n+n)=0
We add all the numbers together, and all the variables
-9n-(-10n-18)-3=0
We get rid of parentheses
-9n+10n+18-3=0
We add all the numbers together, and all the variables
n+15=0
We move all terms containing n to the left, all other terms to the right
n=-15
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