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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/b = 3/7 // - 3/7
6/b-(3/7) = 0
6/b-3/7 = 0
6*b^-1 = 3/7 // : 6
b^-1 = 1/14
-1 < 0
1/(b^1) = 1/14 // * b^1
1 = 1/14*b^1 // : 1/14
14 = b^1
b = 14
b = 14
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