3b-21=3b-21

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Solution for 3b-21=3b-21 equation: 



3b-21=3b-21

We move all terms to the left:

3b-21-(3b-21)=0

We get rid of parentheses

3b-3b+21-21=0

We add all the numbers together, and all the variables

=0

b=0/1

b=0

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