-21=w+7

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Solution for -21=w+7 equation: 



-21=w+7

We move all terms to the left:

-21-(w+7)=0

We get rid of parentheses

-w-7-21=0

We add all the numbers together, and all the variables

-1w-28=0

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

-w=28

w=28/-1

w=-28

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