-2w+9w=-21

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Solution for -2w+9w=-21 equation: 



-2w+9w=-21

We move all terms to the left:

-2w+9w-(-21)=0

We add all the numbers together, and all the variables

7w+21=0

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

7w=-21

w=-21/7

w=-3

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