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D( x )
-3*x^7*y^3 = 0
-3*x^7*y^3 = 0
-3*x^7*y^3 = 0
-3*x^7*y^3 = 0 // : -3*y^3
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
(15*x^12*y^6)/(-3*x^7*y^3) = 0
-5*x^5*y^3 = 0 // : -5*y^3
x^5 = 0
x = 0
x in { 0}
x belongs to the empty set
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