90=9n+n

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Solution for 90=9n+n equation: 



90=9n+n

We move all terms to the left:

90-(9n+n)=0

We add all the numbers together, and all the variables

-(+10n)+90=0

We get rid of parentheses

-10n+90=0

We move all terms containing n to the left, all other terms to the right

-10n=-90

n=-90/-10

n=+9

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