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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7.8/b = 3.46/9.4 // - 3.46/9.4
7.8/b-(3.46/9.4) = 0
7.8/b-0.36808511 = 0
7.8*b^-1 = 0.36808511 // : 7.8
b^-1 = 0.0471904
-1 < 0
1/(b^1) = 0.0471904 // * b^1
1 = 0.0471904*b^1 // : 0.0471904
21.19075066 = b^1
b = 21.19075066
b = 21.19075066
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