13=21-4w

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Solution for 13=21-4w equation: 



13=21-4w

We move all terms to the left:

13-(21-4w)=0

We add all the numbers together, and all the variables

-(-4w+21)+13=0

We get rid of parentheses

4w-21+13=0

We add all the numbers together, and all the variables

4w-8=0

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

4w=8

w=8/4

w=2

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