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810=729+9n
We move all terms to the left:
810-(729+9n)=0
We add all the numbers together, and all the variables
-(9n+729)+810=0
We get rid of parentheses
-9n-729+810=0
We add all the numbers together, and all the variables
-9n+81=0
We move all terms containing n to the left, all other terms to the right
-9n=-81
n=-81/-9
n=+9
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