w=21-0.5w

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Solution for w=21-0.5w equation: 



w=21-0.5w

We move all terms to the left:

w-(21-0.5w)=0

We add all the numbers together, and all the variables

w-(-0.5w+21)=0

We get rid of parentheses

w+0.5w-21=0

We add all the numbers together, and all the variables

1.5w-21=0

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

1.5w=21

w=21/1.5

w=14

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