2b-21=b-13

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Solution for 2b-21=b-13 equation: 



2b-21=b-13

We move all terms to the left:

2b-21-(b-13)=0

We get rid of parentheses

2b-b+13-21=0

We add all the numbers together, and all the variables

b-8=0

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

b=8

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