8b-12=12b-21

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Solution for 8b-12=12b-21 equation: 



8b-12=12b-21

We move all terms to the left:

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

We get rid of parentheses

8b-12b+21-12=0

We add all the numbers together, and all the variables

-4b+9=0

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

-4b=-9

b=-9/-4

b=2+1/4

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