21=7-7w

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Solution for 21=7-7w equation: 



21=7-7w

We move all terms to the left:

21-(7-7w)=0

We add all the numbers together, and all the variables

-(-7w+7)+21=0

We get rid of parentheses

7w-7+21=0

We add all the numbers together, and all the variables

7w+14=0

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

7w=-14

w=-14/7

w=-2

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