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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
23.674/b = 38 // - 38
23.674/b-38 = 0
23.674*b^-1 = 38 // : 23.674
b^-1 = 1.60513644
-1 < 0
1/(b^1) = 1.60513644 // * b^1
1 = 1.60513644*b^1 // : 1.60513644
0.623 = b^1
b = 0.623
b = 0.623
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