2b+9=8b+21

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Solution for 2b+9=8b+21 equation: 



2b+9=8b+21

We move all terms to the left:

2b+9-(8b+21)=0

We get rid of parentheses

2b-8b-21+9=0

We add all the numbers together, and all the variables

-6b-12=0

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

-6b=12

b=12/-6

b=-2

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