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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
57/b = 8 // - 8
57/b-8 = 0
57*b^-1 = 8 // : 57
b^-1 = 8/57
-1 < 0
1/(b^1) = 8/57 // * b^1
1 = 8/57*b^1 // : 8/57
57/8 = b^1
b = 57/8
b = 57/8
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