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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-4/b = 9/4 // - 9/4
-4/b-(9/4) = 0
-4/b-9/4 = 0
-4*b^-1 = 9/4 // : -4
b^-1 = -9/16
-1 < 0
1/(b^1) = -9/16 // * b^1
1 = -9/16*b^1 // : -9/16
-16/9 = b^1
b = -16/9
b = -16/9
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