3b-6=-2b-21

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



3b-6=-2b-21

We move all terms to the left:

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

We get rid of parentheses

3b+2b+21-6=0

We add all the numbers together, and all the variables

5b+15=0

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

5b=-15

b=-15/5

b=-3

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