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D( x )
((4*x)/3)*y^2 = 0
((4*x)/3)*y^2 = 0
((4*x)/3)*y^2 = 0
4/3*x*y^2 = 0 // : 4/3*y^2
x = 0
x in (-oo:0) U (0:+oo)
(((7*x^2)/4)*y^3)/(((4*x)/3)*y^2) = 0
21/16*x*y = 0 // : 21/16*y
x = 0
x in { 0}
x belongs to the empty set
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