-n+21=-3(5n+7)

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Solution for -n+21=-3(5n+7) equation: 



-n+21=-3(5n+7)

We move all terms to the left:

-n+21-(-3(5n+7))=0

We add all the numbers together, and all the variables

-1n-(-3(5n+7))+21=0



We calculate terms in parentheses: -(-3(5n+7)), so:

-3(5n+7)

We multiply parentheses

-15n-21

Back to the equation:

-(-15n-21)



We get rid of parentheses

-1n+15n+21+21=0

We add all the numbers together, and all the variables

14n+42=0

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

14n=-42

n=-42/14

n=-3

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