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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
9/6 = 81/b // - 81/b
9/6-(81/b) = 0
9/6-81*b^-1 = 0
-81*b^-1 = -3/2 // : -81
b^-1 = 1/54
-1 < 0
1/(b^1) = 1/54 // * b^1
1 = 1/54*b^1 // : 1/54
54 = b^1
b = 54
b = 54
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