7n-21=4n+2+4

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Solution for 7n-21=4n+2+4 equation: 



7n-21=4n+2+4

We move all terms to the left:

7n-21-(4n+2+4)=0

We add all the numbers together, and all the variables

7n-(4n+6)-21=0

We get rid of parentheses

7n-4n-6-21=0

We add all the numbers together, and all the variables

3n-27=0

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

3n=27

n=27/3

n=9

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