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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
12/b = 5/7 // - 5/7
12/b-(5/7) = 0
12/b-5/7 = 0
12*b^-1 = 5/7 // : 12
b^-1 = 5/84
-1 < 0
1/(b^1) = 5/84 // * b^1
1 = 5/84*b^1 // : 5/84
84/5 = b^1
b = 84/5
b = 84/5
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