7w+21=-3w-9

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Solution for 7w+21=-3w-9 equation: 



7w+21=-3w-9

We move all terms to the left:

7w+21-(-3w-9)=0

We get rid of parentheses

7w+3w+9+21=0

We add all the numbers together, and all the variables

10w+30=0

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

10w=-30

w=-30/10

w=-3

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