91=-7(n-4)

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Solution for 91=-7(n-4) equation: 



91=-7(n-4)

We move all terms to the left:

91-(-7(n-4))=0



We calculate terms in parentheses: -(-7(n-4)), so:

-7(n-4)

We multiply parentheses

-7n+28

Back to the equation:

-(-7n+28)



We get rid of parentheses

7n-28+91=0

We add all the numbers together, and all the variables

7n+63=0

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

7n=-63

n=-63/7

n=-9

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