21=3w+4(w-7)

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Solution for 21=3w+4(w-7) equation: 



21=3w+4(w-7)

We move all terms to the left:

21-(3w+4(w-7))=0



We calculate terms in parentheses: -(3w+4(w-7)), so:

3w+4(w-7)

We multiply parentheses

3w+4w-28

We add all the numbers together, and all the variables

7w-28

Back to the equation:

-(7w-28)



We get rid of parentheses

-7w+28+21=0

We add all the numbers together, and all the variables

-7w+49=0

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

-7w=-49

w=-49/-7

w=+7

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