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

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



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

We move all terms to the left:

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



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

3w+3(w+7)

We multiply parentheses

3w+3w+21

We add all the numbers together, and all the variables

6w+21

Back to the equation:

-(6w+21)



We get rid of parentheses

-6w-21-21=0

We add all the numbers together, and all the variables

-6w-42=0

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

-6w=42

w=42/-6

w=-7

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