7n-21=7(3n+1)

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Solution for 7n-21=7(3n+1) equation: 



7n-21=7(3n+1)

We move all terms to the left:

7n-21-(7(3n+1))=0



We calculate terms in parentheses: -(7(3n+1)), so:

7(3n+1)

We multiply parentheses

21n+7

Back to the equation:

-(21n+7)



We get rid of parentheses

7n-21n-7-21=0

We add all the numbers together, and all the variables

-14n-28=0

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

-14n=28

n=28/-14

n=-2

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