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D( x )
30*x*y^-1 = 0
30*x*y^-1 = 0
30*x*y^-1 = 0
30*x*y^-1 = 0 // : 30*y^-1
x = 0
x in (-oo:0) U (0:+oo)
(20*24*x^3*y^3)/(30*x*y^-1) = 0
16*x^2*y^4 = 0 // : 16*y^4
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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