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