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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4*((x^-12*y^5)/5)*y^-6 = 0
1/5*x^-16*y^-1 = 0 // : 1/5*y^-1
x^-16 = 0
x naleu017Cy do O
x belongs to the empty set
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