12w-9w=-21

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Solution for 12w-9w=-21 equation: 



12w-9w=-21

We move all terms to the left:

12w-9w-(-21)=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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