w=21-6w

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Solution for w=21-6w equation: 



w=21-6w

We move all terms to the left:

w-(21-6w)=0

We add all the numbers together, and all the variables

w-(-6w+21)=0

We get rid of parentheses

w+6w-21=0

We add all the numbers together, and all the variables

7w-21=0

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

7w=21

w=21/7

w=3

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