9b+3=12b-15

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Solution for 9b+3=12b-15 equation: 



9b+3=12b-15

We move all terms to the left:

9b+3-(12b-15)=0

We get rid of parentheses

9b-12b+15+3=0

We add all the numbers together, and all the variables

-3b+18=0

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

-3b=-18

b=-18/-3

b=+6

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