-21=-w-4

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Solution for -21=-w-4 equation: 



-21=-w-4

We move all terms to the left:

-21-(-w-4)=0

We add all the numbers together, and all the variables

-(-1w-4)-21=0

We get rid of parentheses

1w+4-21=0

We add all the numbers together, and all the variables

w-17=0

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

w=17

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