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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(3/5)/b = -2 // + 2
(3/5)/b+2 = 0
3/5*b^-1 = -2 // : 3/5
b^-1 = -10/3
-1 < 0
1/(b^1) = -10/3 // * b^1
1 = -10/3*b^1 // : -10/3
-3/10 = b^1
b = -3/10
b = -3/10
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