12=13+7b

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Solution for 12=13+7b equation: 



12=13+7b

We move all terms to the left:

12-(13+7b)=0

We add all the numbers together, and all the variables

-(7b+13)+12=0

We get rid of parentheses

-7b-13+12=0

We add all the numbers together, and all the variables

-7b-1=0

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

-7b=1

b=1/-7

b=-1/7

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