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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8747/b = 113/100 // - 113/100
8747/b-(113/100) = 0
8747/b-113/100 = 0
8747*b^-1 = 113/100 // : 8747
b^-1 = 113/874700
-1 < 0
1/(b^1) = 113/874700 // * b^1
1 = 113/874700*b^1 // : 113/874700
874700/113 = b^1
b = 874700/113
b = 874700/113
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