399=-7(-1+8n)

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Solution for 399=-7(-1+8n) equation: 



399=-7(-1+8n)

We move all terms to the left:

399-(-7(-1+8n))=0

We add all the numbers together, and all the variables

-(-7(8n-1))+399=0



We calculate terms in parentheses: -(-7(8n-1)), so:

-7(8n-1)

We multiply parentheses

-56n+7

Back to the equation:

-(-56n+7)



We get rid of parentheses

56n-7+399=0

We add all the numbers together, and all the variables

56n+392=0

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

56n=-392

n=-392/56

n=-7

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