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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8/b = 32 // - 32
8/b-32 = 0
8*b^-1 = 32 // : 8
b^-1 = 4
-1 < 0
1/(b^1) = 4 // * b^1
1 = 4*b^1 // : 4
1/4 = b^1
b = 1/4
b = 1/4
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