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

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



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

We move all terms to the left:

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



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

-7w+5(w+5)

We multiply parentheses

-7w+5w+25

We add all the numbers together, and all the variables

-2w+25

Back to the equation:

-(-2w+25)



We get rid of parentheses

2w-25+21=0

We add all the numbers together, and all the variables

2w-4=0

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

2w=4

w=4/2

w=2

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