21=28n-3(7n+0)

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Solution for 21=28n-3(7n+0) equation: 



21=28n-3(7n+0)

We move all terms to the left:

21-(28n-3(7n+0))=0

We add all the numbers together, and all the variables

-(28n-3(+7n))+21=0



We calculate terms in parentheses: -(28n-3(+7n)), so:

28n-3(+7n)

We multiply parentheses

28n-21n

We add all the numbers together, and all the variables

7n

Back to the equation:

-(7n)



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

-7n=-21

n=-21/-7

n=+3

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