9-4w=21

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Solution for 9-4w=21 equation: 



9-4w=21

We move all terms to the left:

9-4w-(21)=0

We add all the numbers together, and all the variables

-4w-12=0

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

-4w=12

w=12/-4

w=-3

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