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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(2/3)/b = 2/5 // - 2/5
(2/3)/b-(2/5) = 0
(2/3)/b-2/5 = 0
2/3*b^-1 = 2/5 // : 2/3
b^-1 = 3/5
-1 < 0
1/(b^1) = 3/5 // * b^1
1 = 3/5*b^1 // : 3/5
5/3 = b^1
b = 5/3
b = 5/3
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