21=4w-7w

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Solution for 21=4w-7w equation: 



21=4w-7w

We move all terms to the left:

21-(4w-7w)=0

We add all the numbers together, and all the variables

-(-3w)+21=0

We get rid of parentheses

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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