12b-15=4b+9

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Solution for 12b-15=4b+9 equation: 



12b-15=4b+9

We move all terms to the left:

12b-15-(4b+9)=0

We get rid of parentheses

12b-4b-9-15=0

We add all the numbers together, and all the variables

8b-24=0

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

8b=24

b=24/8

b=3

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