-72=-4(n-81)

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Solution for -72=-4(n-81) equation: 



-72=-4(n-81)

We move all terms to the left:

-72-(-4(n-81))=0



We calculate terms in parentheses: -(-4(n-81)), so:

-4(n-81)

We multiply parentheses

-4n+324

Back to the equation:

-(-4n+324)



We get rid of parentheses

4n-324-72=0

We add all the numbers together, and all the variables

4n-396=0

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

4n=396

n=396/4

n=99

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