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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
9/b = 3/2 // - 3/2
9/b-(3/2) = 0
9/b-3/2 = 0
9*b^-1 = 3/2 // : 9
b^-1 = 1/6
-1 < 0
1/(b^1) = 1/6 // * b^1
1 = 1/6*b^1 // : 1/6
6 = b^1
b = 6
b = 6
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