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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(3*x)^0*((4*x^2)/3)*y*(x*((6*y)/2))^2 = 0
((4*x^2)/3)*y*(x*((6*y)/2))^2 = 0
12*x^4*y^3 = 0 // : 12*y^3
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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