-21+7n=7n-7(3+6n)

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Solution for -21+7n=7n-7(3+6n) equation: 



-21+7n=7n-7(3+6n)

We move all terms to the left:

-21+7n-(7n-7(3+6n))=0

We add all the numbers together, and all the variables

7n-(7n-7(6n+3))-21=0



We calculate terms in parentheses: -(7n-7(6n+3)), so:

7n-7(6n+3)

We multiply parentheses

7n-42n-21

We add all the numbers together, and all the variables

-35n-21

Back to the equation:

-(-35n-21)



We get rid of parentheses

7n+35n+21-21=0

We add all the numbers together, and all the variables

42n=0

n=0/42

n=0

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