21=6-3w

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Solution for 21=6-3w equation: 



21=6-3w

We move all terms to the left:

21-(6-3w)=0

We add all the numbers together, and all the variables

-(-3w+6)+21=0

We get rid of parentheses

3w-6+21=0

We add all the numbers together, and all the variables

3w+15=0

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

3w=-15

w=-15/3

w=-5

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