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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
45/b = 12/23 // - 12/23
45/b-(12/23) = 0
45/b-12/23 = 0
45*b^-1 = 12/23 // : 45
b^-1 = 4/345
-1 < 0
1/(b^1) = 4/345 // * b^1
1 = 4/345*b^1 // : 4/345
345/4 = b^1
b = 345/4
b = 345/4
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