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D( b )
1.5*b*b = 0
1.5*b*b = 0
1.5*b*b = 0
1.5*b^2 = 0 // : 1.5
b^2 = 0
b = 0
b in (-oo:0) U (0:+oo)
(1.5*b*b)/(1.5*b*b) = 50 // - 50
(1.5*b*b)/(1.5*b*b)-50 = 0
-49 = 0
b belongs to the empty set
b belongs to the empty set
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