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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
5/b = 10 // - 10
5/b-10 = 0
5*b^-1 = 10 // : 5
b^-1 = 2
-1 < 0
1/(b^1) = 2 // * b^1
1 = 2*b^1 // : 2
1/2 = b^1
b = 1/2
b = 1/2
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