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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
837/b = 954/848 // - 954/848
837/b-(954/848) = 0
837/b-9/8 = 0
837*b^-1 = 9/8 // : 837
b^-1 = 1/744
-1 < 0
1/(b^1) = 1/744 // * b^1
1 = 1/744*b^1 // : 1/744
744 = b^1
b = 744
b = 744
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