-2b+9=3b-21

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Solution for -2b+9=3b-21 equation: 



-2b+9=3b-21

We move all terms to the left:

-2b+9-(3b-21)=0

We get rid of parentheses

-2b-3b+21+9=0

We add all the numbers together, and all the variables

-5b+30=0

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

-5b=-30

b=-30/-5

b=+6

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