21=3-9w

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Solution for 21=3-9w equation: 



21=3-9w

We move all terms to the left:

21-(3-9w)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

9w-3+21=0

We add all the numbers together, and all the variables

9w+18=0

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

9w=-18

w=-18/9

w=-2

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