12w-15w=21

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Solution for 12w-15w=21 equation: 



12w-15w=21

We move all terms to the left:

12w-15w-(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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