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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8.993/b = 391 // - 391
8.993/b-391 = 0
8.993*b^-1 = 391 // : 8.993
b^-1 = 43.47826087
-1 < 0
1/(b^1) = 43.47826087 // * b^1
1 = 43.47826087*b^1 // : 43.47826087
0.023 = b^1
b = 0.023
b = 0.023
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