-21=9-3w

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Solution for -21=9-3w equation: 



-21=9-3w

We move all terms to the left:

-21-(9-3w)=0

We add all the numbers together, and all the variables

-(-3w+9)-21=0

We get rid of parentheses

3w-9-21=0

We add all the numbers together, and all the variables

3w-30=0

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

3w=30

w=30/3

w=10

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