-21+7n=7+7(8-n)

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Solution for -21+7n=7+7(8-n) equation: 



-21+7n=7+7(8-n)

We move all terms to the left:

-21+7n-(7+7(8-n))=0

We add all the numbers together, and all the variables

7n-(7+7(-1n+8))-21=0



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

7+7(-1n+8)

determiningTheFunctionDomain
7(-1n+8)+7

We multiply parentheses

-7n+56+7

We add all the numbers together, and all the variables

-7n+63

Back to the equation:

-(-7n+63)



We get rid of parentheses

7n+7n-63-21=0

We add all the numbers together, and all the variables

14n-84=0

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

14n=84

n=84/14

n=6

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