13=-7w+3(w+7)

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Solution for 13=-7w+3(w+7) equation: 



13=-7w+3(w+7)

We move all terms to the left:

13-(-7w+3(w+7))=0



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

-7w+3(w+7)

We multiply parentheses

-7w+3w+21

We add all the numbers together, and all the variables

-4w+21

Back to the equation:

-(-4w+21)



We get rid of parentheses

4w-21+13=0

We add all the numbers together, and all the variables

4w-8=0

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

4w=8

w=8/4

w=2

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