8/b-9/5

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Solution for 8/b-9/5 equation: 


D( b )

b = 0

b = 0

b = 0

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

8/b-(9/5) = 0

8/b-9/5 = 0

8*b^-1 = 9/5 // : 8

b^-1 = 9/40

-1 < 0

1/(b^1) = 9/40 // * b^1

1 = 9/40*b^1 // : 9/40

40/9 = b^1

b = 40/9

b = 40/9

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