4=-8+b

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Solution for 4=-8+b equation: 



4=-8+b

We move all terms to the left:

4-(-8+b)=0

We add all the numbers together, and all the variables

-(b-8)+4=0

We get rid of parentheses

-b+8+4=0

We add all the numbers together, and all the variables

-1b+12=0

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

-b=-12

b=-12/-1

b=+12

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