6b+3b-21=2+5b+5

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Solution for 6b+3b-21=2+5b+5 equation: 



6b+3b-21=2+5b+5

We move all terms to the left:

6b+3b-21-(2+5b+5)=0

We add all the numbers together, and all the variables

6b+3b-(5b+7)-21=0

We add all the numbers together, and all the variables

9b-(5b+7)-21=0

We get rid of parentheses

9b-5b-7-21=0

We add all the numbers together, and all the variables

4b-28=0

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

4b=28

b=28/4

b=7

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