12b+17=8b+21

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Solution for 12b+17=8b+21 equation: 



12b+17=8b+21

We move all terms to the left:

12b+17-(8b+21)=0

We get rid of parentheses

12b-8b-21+17=0

We add all the numbers together, and all the variables

4b-4=0

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

4b=4

b=4/4

b=1

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