b-12=18-9b

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Solution for b-12=18-9b equation: 



b-12=18-9b

We move all terms to the left:

b-12-(18-9b)=0

We add all the numbers together, and all the variables

b-(-9b+18)-12=0

We get rid of parentheses

b+9b-18-12=0

We add all the numbers together, and all the variables

10b-30=0

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

10b=30

b=30/10

b=3

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