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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/b = -2/5 // + -2/5
3/b-(-2/5) = 0
3/b+2/5 = 0
3*b^-1 = -2/5 // : 3
b^-1 = -2/15
-1 < 0
1/(b^1) = -2/15 // * b^1
1 = -2/15*b^1 // : -2/15
-15/2 = b^1
b = -15/2
b = -15/2
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