(n+2n)+(6+3)=90

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Solution for (n+2n)+(6+3)=90 equation: 



(n+2n)+(6+3)=90

We move all terms to the left:

(n+2n)+(6+3)-(90)=0

determiningTheFunctionDomain
(n+2n)-90+(6+3)=0

We add all the numbers together, and all the variables

(+3n)-90+9=0

We add all the numbers together, and all the variables

(+3n)-81=0

We get rid of parentheses

3n-81=0

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

3n=81

n=81/3

n=27

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