12=8-4b

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Solution for 12=8-4b equation: 



12=8-4b

We move all terms to the left:

12-(8-4b)=0

We add all the numbers together, and all the variables

-(-4b+8)+12=0

We get rid of parentheses

4b-8+12=0

We add all the numbers together, and all the variables

4b+4=0

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

4b=-4

b=-4/4

b=-1

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