15+9b=12+11b

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Solution for 15+9b=12+11b equation: 



15+9b=12+11b

We move all terms to the left:

15+9b-(12+11b)=0

We add all the numbers together, and all the variables

9b-(11b+12)+15=0

We get rid of parentheses

9b-11b-12+15=0

We add all the numbers together, and all the variables

-2b+3=0

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

-2b=-3

b=-3/-2

b=1+1/2

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