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(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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