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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-27/b = -3 // + 3
3-27/b = 0
-27*b^-1 = -3 // : -27
b^-1 = 1/9
-1 < 0
1/(b^1) = 1/9 // * b^1
1 = 1/9*b^1 // : 1/9
9 = b^1
b = 9
b = 9
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