90=5(n-81)

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Solution for 90=5(n-81) equation: 



90=5(n-81)

We move all terms to the left:

90-(5(n-81))=0



We calculate terms in parentheses: -(5(n-81)), so:

5(n-81)

We multiply parentheses

5n-405

Back to the equation:

-(5n-405)



We get rid of parentheses

-5n+405+90=0

We add all the numbers together, and all the variables

-5n+495=0

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

-5n=-495

n=-495/-5

n=+99

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