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D( x )
(3*((4*x)/y)*y^2)/2 = 0
(3*((4*x)/y)*y^2)/2 = 0
(3*((4*x)/y)*y^2)/2 = 0
6*x*y = 0 // : 6*y
x = 0
x in (-oo:0) U (0:+oo)
(6*x^2)/((3*((4*x)/y)*y^2)/2) = 0
x*y^-1 = 0 // : y^-1
x = 0
x in { 0}
x belongs to the empty set
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