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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8/b = 4/5 // - 4/5
8/b-(4/5) = 0
8/b-4/5 = 0
8*b^-1 = 4/5 // : 8
b^-1 = 1/10
-1 < 0
1/(b^1) = 1/10 // * b^1
1 = 1/10*b^1 // : 1/10
10 = b^1
b = 10
b = 10
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