15b-12b=9

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Solution for 15b-12b=9 equation: 



15b-12b=9

We move all terms to the left:

15b-12b-(9)=0

We add all the numbers together, and all the variables

3b-9=0

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

3b=9

b=9/3

b=3

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