4=20/b

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Solution for 4=20/b equation: 


D( b )

b = 0

b = 0

b = 0

b in (-oo:0) U (0:+oo)

4 = 20/b // - 20/b

4-(20/b) = 0

4-20*b^-1 = 0

-20*b^-1 = -4 // : -20

b^-1 = 1/5

-1 < 0

1/(b^1) = 1/5 // * b^1

1 = 1/5*b^1 // : 1/5

5 = b^1

b = 5

b = 5

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