-21=5(w-3)-7w

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



-21=5(w-3)-7w

We move all terms to the left:

-21-(5(w-3)-7w)=0



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

5(w-3)-7w

We add all the numbers together, and all the variables

-7w+5(w-3)

We multiply parentheses

-7w+5w-15

We add all the numbers together, and all the variables

-2w-15

Back to the equation:

-(-2w-15)



We get rid of parentheses

2w+15-21=0

We add all the numbers together, and all the variables

2w-6=0

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

2w=6

w=6/2

w=3

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