9w+21=12w

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Solution for 9w+21=12w equation: 



9w+21=12w

We move all terms to the left:

9w+21-(12w)=0

We add all the numbers together, and all the variables

-3w+21=0

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

-3w=-21

w=-21/-3

w=+7

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