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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/b = 2/8 // - 2/8
6/b-(2/8) = 0
6/b-1/4 = 0
6*b^-1 = 1/4 // : 6
b^-1 = 1/24
-1 < 0
1/(b^1) = 1/24 // * b^1
1 = 1/24*b^1 // : 1/24
24 = b^1
b = 24
b = 24
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