7n-21=3+3n

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Solution for 7n-21=3+3n equation: 



7n-21=3+3n

We move all terms to the left:

7n-21-(3+3n)=0

We add all the numbers together, and all the variables

7n-(3n+3)-21=0

We get rid of parentheses

7n-3n-3-21=0

We add all the numbers together, and all the variables

4n-24=0

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

4n=24

n=24/4

n=6

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