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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
84.2/b = 100/33.1 // - 100/33.1
84.2/b-(100/33.1) = 0
84.2/b-3.02114804 = 0
84.2*b^-1 = 3.02114804 // : 84.2
b^-1 = 0.03588062
-1 < 0
1/(b^1) = 0.03588062 // * b^1
1 = 0.03588062*b^1 // : 0.03588062
27.87019845 = b^1
b = 27.87019845
b = 27.87019845
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