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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/b = 7/4 // - 7/4
3/b-(7/4) = 0
3/b-7/4 = 0
3*b^-1 = 7/4 // : 3
b^-1 = 7/12
-1 < 0
1/(b^1) = 7/12 // * b^1
1 = 7/12*b^1 // : 7/12
12/7 = b^1
b = 12/7
b = 12/7
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