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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7/b = 7/5 // - 7/5
7/b-(7/5) = 0
7/b-7/5 = 0
7*b^-1 = 7/5 // : 7
b^-1 = 1/5
-1 < 0
1/(b^1) = 1/5 // * b^1
1 = 1/5*b^1 // : 1/5
5 = b^1
b = 5
b = 5
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