(n-9)*10=80

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Solution for (n-9)*10=80 equation: 



(n-9)*10=80

We move all terms to the left:

(n-9)*10-(80)=0

We multiply parentheses

10n-90-80=0

We add all the numbers together, and all the variables

10n-170=0

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

10n=170

n=170/10

n=17

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