-21=-3(w+-1)

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



-21=-3(w+-1)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-3(w-1)), so:

-3(w-1)

We multiply parentheses

-3w+3

Back to the equation:

-(-3w+3)



We get rid of parentheses

3w-3-21=0

We add all the numbers together, and all the variables

3w-24=0

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

3w=24

w=24/3

w=8

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