21-7w=21-7w

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Solution for 21-7w=21-7w equation: 



21-7w=21-7w

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-7w+7w-21+21=0

We add all the numbers together, and all the variables

=0

w=0/1

w=0

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