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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/0.8 = 11/b // - 11/b
3/0.8-(11/b) = 0
3/0.8-11*b^-1 = 0
-11*b^-1 = -3.75 // : -11
b^-1 = 0.34090909
-1 < 0
1/(b^1) = 0.34090909 // * b^1
1 = 0.34090909*b^1 // : 0.34090909
2.93333334 = b^1
b = 2.93333334
b = 2.93333334
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