8/b+5-4/b+5

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Solution for 8/b+5-4/b+5 equation: 


D( b )

b = 0

b = 0

b = 0

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

8/b-(4/b)+5+5 = 0

8/b-4*b^-1+5+5 = 0

4*b^-1 = -10 // : 4

b^-1 = -5/2

-1 < 0

1/(b^1) = -5/2 // * b^1

1 = -5/2*b^1 // : -5/2

-2/5 = b^1

b = -2/5

b = -2/5

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