21=(-7w)

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Solution for 21=(-7w) equation: 



21=(-7w)

We move all terms to the left:

21-((-7w))=0



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

(-7w)

We get rid of parentheses

-7w

Back to the equation:

-(-7w)



We get rid of parentheses

7w+21=0

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

7w=-21

w=-21/7

w=-3

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