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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/b-1 = 9/1 // - 9/1
6/b-(9/1)-1 = 0
6/b-9-1 = 0
6*b^-1 = 10 // : 6
b^-1 = 5/3
-1 < 0
1/(b^1) = 5/3 // * b^1
1 = 5/3*b^1 // : 5/3
3/5 = b^1
b = 3/5
b = 3/5
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