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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/0.72 = 12/b // - 12/b
3/0.72-(12/b) = 0
3/0.72-12*b^-1 = 0
-12*b^-1 = -4.16666667 // : -12
b^-1 = 0.34722222
-1 < 0
1/(b^1) = 0.34722222 // * b^1
1 = 0.34722222*b^1 // : 0.34722222
2.88000002 = b^1
b = 2.88000002
b = 2.88000002
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