21=3w+6(w+5)

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Solution for 21=3w+6(w+5) equation: 



21=3w+6(w+5)

We move all terms to the left:

21-(3w+6(w+5))=0



We calculate terms in parentheses: -(3w+6(w+5)), so:

3w+6(w+5)

We multiply parentheses

3w+6w+30

We add all the numbers together, and all the variables

9w+30

Back to the equation:

-(9w+30)



We get rid of parentheses

-9w-30+21=0

We add all the numbers together, and all the variables

-9w-9=0

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

-9w=9

w=9/-9

w=-1

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