21=2w+9

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Solution for 21=2w+9 equation: 



21=2w+9

We move all terms to the left:

21-(2w+9)=0

We get rid of parentheses

-2w-9+21=0

We add all the numbers together, and all the variables

-2w+12=0

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

-2w=-12

w=-12/-2

w=+6

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