-20=4b-8

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Solution for -20=4b-8 equation: 



-20=4b-8

We move all terms to the left:

-20-(4b-8)=0

We get rid of parentheses

-4b+8-20=0

We add all the numbers together, and all the variables

-4b-12=0

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

-4b=12

b=12/-4

b=-3

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