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D( x )
x^-6 = 0
x = 0
x^-6 = 0
x^-6 = 0
1*x^-6 = 0 // : 1
x^-6 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-5*y^7)/(x^-6) = 0
x*y^7 = 0 // : y^7
x = 0
x in { 0}
x belongs to the empty set
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