12/15=20/b

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Solution for 12/15=20/b equation: 


D( b )

b = 0

b = 0

b = 0

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

12/15 = 20/b // - 20/b

12/15-(20/b) = 0

12/15-20*b^-1 = 0

-20*b^-1 = -4/5 // : -20

b^-1 = 1/25

-1 < 0

1/(b^1) = 1/25 // * b^1

1 = 1/25*b^1 // : 1/25

25 = b^1

b = 25

b = 25

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