-21=7w+8(w+3)

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Solution for -21=7w+8(w+3) equation: 



-21=7w+8(w+3)

We move all terms to the left:

-21-(7w+8(w+3))=0



We calculate terms in parentheses: -(7w+8(w+3)), so:

7w+8(w+3)

We multiply parentheses

7w+8w+24

We add all the numbers together, and all the variables

15w+24

Back to the equation:

-(15w+24)



We get rid of parentheses

-15w-24-21=0

We add all the numbers together, and all the variables

-15w-45=0

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

-15w=45

w=45/-15

w=-3

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