21+7n=-7(1-5n)

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Solution for 21+7n=-7(1-5n) equation: 



21+7n=-7(1-5n)

We move all terms to the left:

21+7n-(-7(1-5n))=0

We add all the numbers together, and all the variables

7n-(-7(-5n+1))+21=0



We calculate terms in parentheses: -(-7(-5n+1)), so:

-7(-5n+1)

We multiply parentheses

35n-7

Back to the equation:

-(35n-7)



We get rid of parentheses

7n-35n+7+21=0

We add all the numbers together, and all the variables

-28n+28=0

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

-28n=-28

n=-28/-28

n=1

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