8b-21=-b+6

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Solution for 8b-21=-b+6 equation: 



8b-21=-b+6

We move all terms to the left:

8b-21-(-b+6)=0

We add all the numbers together, and all the variables

8b-(-1b+6)-21=0

We get rid of parentheses

8b+1b-6-21=0

We add all the numbers together, and all the variables

9b-27=0

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

9b=27

b=27/9

b=3

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