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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
12/15 = 18/b // - 18/b
12/15-(18/b) = 0
12/15-18*b^-1 = 0
-18*b^-1 = -4/5 // : -18
b^-1 = 2/45
-1 < 0
1/(b^1) = 2/45 // * b^1
1 = 2/45*b^1 // : 2/45
45/2 = b^1
b = 45/2
b = 45/2
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