21=4w-15

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Solution for 21=4w-15 equation: 



21=4w-15

We move all terms to the left:

21-(4w-15)=0

We get rid of parentheses

-4w+15+21=0

We add all the numbers together, and all the variables

-4w+36=0

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

-4w=-36

w=-36/-4

w=+9

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