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-10n=-9n+9
We move all terms to the left:
-10n-(-9n+9)=0
We get rid of parentheses
-10n+9n-9=0
We add all the numbers together, and all the variables
-1n-9=0
We move all terms containing n to the left, all other terms to the right
-n=9
n=9/-1
n=-9
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