9+7b=12+13b

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Solution for 9+7b=12+13b equation: 



9+7b=12+13b

We move all terms to the left:

9+7b-(12+13b)=0

We add all the numbers together, and all the variables

7b-(13b+12)+9=0

We get rid of parentheses

7b-13b-12+9=0

We add all the numbers together, and all the variables

-6b-3=0

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

-6b=3

b=3/-6

b=-1/2

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