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D( x )
x = 0
x^-8 = 0
x = 0
x = 0
x^-8 = 0
x^-8 = 0
1*x^-8 = 0 // : 1
x^-8 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((36*x^-3*y^2)/(x^-8))*y^9 = 0
36*x^5*y^11 = 0 // : 36*y^11
x^5 = 0
x = 0
x in { 0}
x belongs to the empty set
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