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D( x )
x^35 = 0
x^35 = 0
x^35 = 0
1*x^35 = 0 // : 1
x^35 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^70*y^150)/(x^35))*y^75 = 0
x^35*y^225 = 0 // : y^225
x^35 = 0
x = 0
x in { 0}
x belongs to the empty set
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