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