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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
10.4/b = 4 // - 4
10.4/b-4 = 0
10.4*b^-1 = 4 // : 10.4
b^-1 = 0.38461538
-1 < 0
1/(b^1) = 0.38461538 // * b^1
1 = 0.38461538*b^1 // : 0.38461538
2.60000003 = b^1
b = 2.60000003
b = 2.60000003
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