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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7/2 = 3/b-4 // - 3/b-4
7/2-(3/b)+4 = 0
7/2-3*b^-1+4 = 0
-3*b^-1 = -15/2 // : -3
b^-1 = 5/2
-1 < 0
1/(b^1) = 5/2 // * b^1
1 = 5/2*b^1 // : 5/2
2/5 = b^1
b = 2/5
b = 2/5
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