20=-0.4b

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Solution for 20=-0.4b equation: 



20=-0.4b

We move all terms to the left:

20-(-0.4b)=0

We get rid of parentheses

0.4b+20=0

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

0.4b=-20

b=-20/0.4

b=-50

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