-3w-21=-7(w-1)

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Solution for -3w-21=-7(w-1) equation: 



-3w-21=-7(w-1)

We move all terms to the left:

-3w-21-(-7(w-1))=0



We calculate terms in parentheses: -(-7(w-1)), so:

-7(w-1)

We multiply parentheses

-7w+7

Back to the equation:

-(-7w+7)



We get rid of parentheses

-3w+7w-7-21=0

We add all the numbers together, and all the variables

4w-28=0

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

4w=28

w=28/4

w=7

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