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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
4/b = 23/16 // - 23/16
4/b-(23/16) = 0
4/b-23/16 = 0
4*b^-1 = 23/16 // : 4
b^-1 = 23/64
-1 < 0
1/(b^1) = 23/64 // * b^1
1 = 23/64*b^1 // : 23/64
64/23 = b^1
b = 64/23
b = 64/23
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