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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/b-1 = 9/7 // - 9/7
6/b-(9/7)-1 = 0
6/b-9/7-1 = 0
6*b^-1 = 16/7 // : 6
b^-1 = 8/21
-1 < 0
1/(b^1) = 8/21 // * b^1
1 = 8/21*b^1 // : 8/21
21/8 = b^1
b = 21/8
b = 21/8
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