-6b+21=12b-15

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Solution for -6b+21=12b-15 equation: 



-6b+21=12b-15

We move all terms to the left:

-6b+21-(12b-15)=0

We get rid of parentheses

-6b-12b+15+21=0

We add all the numbers together, and all the variables

-18b+36=0

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

-18b=-36

b=-36/-18

b=+2

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