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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
1/b = 6/29 // - 6/29
1/b-(6/29) = 0
1/b-6/29 = 0
1*b^-1 = 6/29 // : 1
b^-1 = 6/29
-1 < 0
1/(b^1) = 6/29 // * b^1
1 = 6/29*b^1 // : 6/29
29/6 = b^1
b = 29/6
b = 29/6
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