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