9/b-15=5/b

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Solution for 9/b-15=5/b equation: 


D( b )

b = 0

b = 0

b = 0

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

9/b-15 = 5/b // - 5/b

9/b-(5/b)-15 = 0

9/b-5*b^-1-15 = 0

4*b^-1 = 15 // : 4

b^-1 = 15/4

-1 < 0

1/(b^1) = 15/4 // * b^1

1 = 15/4*b^1 // : 15/4

4/15 = b^1

b = 4/15

b = 4/15

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