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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
2-(3/b) = -5/2 // + -5/2
2-(3/b)-(-5/2) = 0
5/2-3*b^-1+2 = 0
-3*b^-1 = -9/2 // : -3
b^-1 = 3/2
-1 < 0
1/(b^1) = 3/2 // * b^1
1 = 3/2*b^1 // : 3/2
2/3 = b^1
b = 2/3
b = 2/3
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