-21=-7w+3(w+5)

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Solution for -21=-7w+3(w+5) equation: 



-21=-7w+3(w+5)

We move all terms to the left:

-21-(-7w+3(w+5))=0



We calculate terms in parentheses: -(-7w+3(w+5)), so:

-7w+3(w+5)

We multiply parentheses

-7w+3w+15

We add all the numbers together, and all the variables

-4w+15

Back to the equation:

-(-4w+15)



We get rid of parentheses

4w-15-21=0

We add all the numbers together, and all the variables

4w-36=0

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

4w=36

w=36/4

w=9

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