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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
1/b = 5/14 // - 5/14
1/b-(5/14) = 0
1/b-5/14 = 0
1*b^-1 = 5/14 // : 1
b^-1 = 5/14
-1 < 0
1/(b^1) = 5/14 // * b^1
1 = 5/14*b^1 // : 5/14
14/5 = b^1
b = 14/5
b = 14/5
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