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