4=-0.8b

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Solution for 4=-0.8b equation: 



4=-0.8b

We move all terms to the left:

4-(-0.8b)=0

We get rid of parentheses

0.8b+4=0

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

0.8b=-4

b=-4/0.8

b=-5

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