90=3n+6n

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Solution for 90=3n+6n equation: 



90=3n+6n

We move all terms to the left:

90-(3n+6n)=0

We add all the numbers together, and all the variables

-(+9n)+90=0

We get rid of parentheses

-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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