-21=6(w+3)+7w

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Solution for -21=6(w+3)+7w equation: 



-21=6(w+3)+7w

We move all terms to the left:

-21-(6(w+3)+7w)=0



We calculate terms in parentheses: -(6(w+3)+7w), so:

6(w+3)+7w

We add all the numbers together, and all the variables

7w+6(w+3)

We multiply parentheses

7w+6w+18

We add all the numbers together, and all the variables

13w+18

Back to the equation:

-(13w+18)



We get rid of parentheses

-13w-18-21=0

We add all the numbers together, and all the variables

-13w-39=0

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

-13w=39

w=39/-13

w=-3

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