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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/b = -4/7 // + -4/7
6/b-(-4/7) = 0
6/b+4/7 = 0
6*b^-1 = -4/7 // : 6
b^-1 = -2/21
-1 < 0
1/(b^1) = -2/21 // * b^1
1 = -2/21*b^1 // : -2/21
-21/2 = b^1
b = -21/2
b = -21/2
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