9(n-80)=90

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Solution for 9(n-80)=90 equation: 



9(n-80)=90

We move all terms to the left:

9(n-80)-(90)=0

We multiply parentheses

9n-720-90=0

We add all the numbers together, and all the variables

9n-810=0

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

9n=810

n=810/9

n=90

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