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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7/b = 9/6 // - 9/6
7/b-(9/6) = 0
7/b-3/2 = 0
7*b^-1 = 3/2 // : 7
b^-1 = 3/14
-1 < 0
1/(b^1) = 3/14 // * b^1
1 = 3/14*b^1 // : 3/14
14/3 = b^1
b = 14/3
b = 14/3
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