20=-2.5b

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Solution for 20=-2.5b equation: 



20=-2.5b

We move all terms to the left:

20-(-2.5b)=0

We get rid of parentheses

2.5b+20=0

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

2.5b=-20

b=-20/2.5

b=-8

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