90=9(n+4)

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Solution for 90=9(n+4) equation: 



90=9(n+4)

We move all terms to the left:

90-(9(n+4))=0



We calculate terms in parentheses: -(9(n+4)), so:

9(n+4)

We multiply parentheses

9n+36

Back to the equation:

-(9n+36)



We get rid of parentheses

-9n-36+90=0

We add all the numbers together, and all the variables

-9n+54=0

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

-9n=-54

n=-54/-9

n=+6

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