9+12b=15b+13

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Solution for 9+12b=15b+13 equation: 



9+12b=15b+13

We move all terms to the left:

9+12b-(15b+13)=0

We get rid of parentheses

12b-15b-13+9=0

We add all the numbers together, and all the variables

-3b-4=0

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

-3b=4

b=4/-3

b=-1+1/3

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