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