21-7n=5-(5n-8)

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Solution for 21-7n=5-(5n-8) equation: 



21-7n=5-(5n-8)

We move all terms to the left:

21-7n-(5-(5n-8))=0



We calculate terms in parentheses: -(5-(5n-8)), so:

5-(5n-8)

determiningTheFunctionDomain
-(5n-8)+5

We get rid of parentheses

-5n+8+5

We add all the numbers together, and all the variables

-5n+13

Back to the equation:

-(-5n+13)



We get rid of parentheses

-7n+5n-13+21=0

We add all the numbers together, and all the variables

-2n+8=0

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

-2n=-8

n=-8/-2

n=+4

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