w-9=21-4w

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Solution for w-9=21-4w equation: 



w-9=21-4w

We move all terms to the left:

w-9-(21-4w)=0

We add all the numbers together, and all the variables

w-(-4w+21)-9=0

We get rid of parentheses

w+4w-21-9=0

We add all the numbers together, and all the variables

5w-30=0

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

5w=30

w=30/5

w=6

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