12-w=-9

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Solution for 12-w=-9 equation: 



12-w=-9

We move all terms to the left:

12-w-(-9)=0

We add all the numbers together, and all the variables

-1w+21=0

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

-w=-21

w=-21/-1

w=+21

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