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