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D( x )
((3*x)/9)*y^2 = 0
((3*x)/9)*y^2 = 0
((3*x)/9)*y^2 = 0
1/3*x*y^2 = 0 // : 1/3*y^2
x = 0
x in (-oo:0) U (0:+oo)
(((8*x^2)/24)*y)/(((3*x)/9)*y^2) = 0
x*y^-1 = 0 // : y^-1
x = 0
x in { 0}
x belongs to the empty set
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