-20=4+8b

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Solution for -20=4+8b equation: 



-20=4+8b

We move all terms to the left:

-20-(4+8b)=0

We add all the numbers together, and all the variables

-(8b+4)-20=0

We get rid of parentheses

-8b-4-20=0

We add all the numbers together, and all the variables

-8b-24=0

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

-8b=24

b=24/-8

b=-3

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