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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