b=0.8b+4

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Solution for b=0.8b+4 equation: 



b=0.8b+4

We move all terms to the left:

b-(0.8b+4)=0

We get rid of parentheses

b-0.8b-4=0

We add all the numbers together, and all the variables

0.2b-4=0

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

0.2b=4

b=4/0.2

b=20

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