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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
5/b = 3/9 // - 3/9
5/b-(3/9) = 0
5/b-1/3 = 0
5*b^-1 = 1/3 // : 5
b^-1 = 1/15
-1 < 0
1/(b^1) = 1/15 // * b^1
1 = 1/15*b^1 // : 1/15
15 = b^1
b = 15
b = 15
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