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10(n+9)+9=9n
We move all terms to the left:
10(n+9)+9-(9n)=0
We add all the numbers together, and all the variables
-9n+10(n+9)+9=0
We multiply parentheses
-9n+10n+90+9=0
We add all the numbers together, and all the variables
n+99=0
We move all terms containing n to the left, all other terms to the right
n=-99
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