12=117-b

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Solution for 12=117-b equation: 



12=117-b

We move all terms to the left:

12-(117-b)=0

We add all the numbers together, and all the variables

-(-1b+117)+12=0

We get rid of parentheses

1b-117+12=0

We add all the numbers together, and all the variables

b-105=0

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

b=105

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