7n-21=19-n

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Solution for 7n-21=19-n equation: 



7n-21=19-n

We move all terms to the left:

7n-21-(19-n)=0

We add all the numbers together, and all the variables

7n-(-1n+19)-21=0

We get rid of parentheses

7n+1n-19-21=0

We add all the numbers together, and all the variables

8n-40=0

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

8n=40

n=40/8

n=5

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