12b+15=15b-18

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Solution for 12b+15=15b-18 equation: 



12b+15=15b-18

We move all terms to the left:

12b+15-(15b-18)=0

We get rid of parentheses

12b-15b+18+15=0

We add all the numbers together, and all the variables

-3b+33=0

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

-3b=-33

b=-33/-3

b=+11

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