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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-255/b = 15 // - 15
-255/b-15 = 0
-255*b^-1 = 15 // : -255
b^-1 = -1/17
-1 < 0
1/(b^1) = -1/17 // * b^1
1 = -1/17*b^1 // : -1/17
-17 = b^1
b = -17
b = -17
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