4b-21=3b+9

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Solution for 4b-21=3b+9 equation: 



4b-21=3b+9

We move all terms to the left:

4b-21-(3b+9)=0

We get rid of parentheses

4b-3b-9-21=0

We add all the numbers together, and all the variables

b-30=0

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

b=30

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