5n-21=7+n

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Solution for 5n-21=7+n equation: 



5n-21=7+n

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

5n-n-7-21=0

We add all the numbers together, and all the variables

4n-28=0

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

4n=28

n=28/4

n=7

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