-21=-7(9+w)

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Solution for -21=-7(9+w) equation: 



-21=-7(9+w)

We move all terms to the left:

-21-(-7(9+w))=0

We add all the numbers together, and all the variables

-(-7(w+9))-21=0



We calculate terms in parentheses: -(-7(w+9)), so:

-7(w+9)

We multiply parentheses

-7w-63

Back to the equation:

-(-7w-63)



We get rid of parentheses

7w+63-21=0

We add all the numbers together, and all the variables

7w+42=0

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

7w=-42

w=-42/7

w=-6

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