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D( x )
12*x^-3*y^3 = 0
x = 0
12*x^-3*y^3 = 0
12*x^-3*y^3 = 0
12*x^-3*y^3 = 0 // : 12*y^3
x^-3 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(24*x^4*y^-6)/(12*x^-3*y^3) = 0
2*x^7*y^-9 = 0 // : 2*y^-9
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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