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D( x )
x^7 = 0
x^7 = 0
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
((X^5*y^7)/(x^7))*y = 0
X^5*x^-7*y^8 = 0 // : X^5*y^8
x^-7 = 0
x naleu017Cy do O
x belongs to the empty set
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