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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
4/11 = 6/b // - 6/b
4/11-(6/b) = 0
4/11-6*b^-1 = 0
-6*b^-1 = -4/11 // : -6
b^-1 = 2/33
-1 < 0
1/(b^1) = 2/33 // * b^1
1 = 2/33*b^1 // : 2/33
33/2 = b^1
b = 33/2
b = 33/2
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