21=b-8

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Solution for 21=b-8 equation: 



21=b-8

We move all terms to the left:

21-(b-8)=0

We get rid of parentheses

-b+8+21=0

We add all the numbers together, and all the variables

-1b+29=0

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

-b=-29

b=-29/-1

b=+29

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