8b+21=4b-3

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Solution for 8b+21=4b-3 equation: 



8b+21=4b-3

We move all terms to the left:

8b+21-(4b-3)=0

We get rid of parentheses

8b-4b+3+21=0

We add all the numbers together, and all the variables

4b+24=0

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

4b=-24

b=-24/4

b=-6

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