3n-21=7(n-3)

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Solution for 3n-21=7(n-3) equation: 



3n-21=7(n-3)

We move all terms to the left:

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



We calculate terms in parentheses: -(7(n-3)), so:

7(n-3)

We multiply parentheses

7n-21

Back to the equation:

-(7n-21)



We get rid of parentheses

3n-7n+21-21=0

We add all the numbers together, and all the variables

-4n=0

n=0/-4

n=0

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