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