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D( x )
x^(3/49) = 0
x^(3/49) = 0
x^(3/49) = 0
1*x^(3/49) = 0 // : 1
x^(3/49) = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^(4/7)*y^2)^(2/7))/(x^(3/49)))*y^(8/21) = 0
x^(5/49)*y^(20/21) = 0 // : y^(20/21)
x^(5/49) = 0
x = 0
x in { 0}
x belongs to the empty set
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