3b+21=2b+8

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Solution for 3b+21=2b+8 equation: 



3b+21=2b+8

We move all terms to the left:

3b+21-(2b+8)=0

We get rid of parentheses

3b-2b-8+21=0

We add all the numbers together, and all the variables

b+13=0

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

b=-13

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