21+3w=-15

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Solution for 21+3w=-15 equation: 



21+3w=-15

We move all terms to the left:

21+3w-(-15)=0

We add all the numbers together, and all the variables

3w+36=0

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

3w=-36

w=-36/3

w=-12

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