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D( x )
11*x^7*y^8 = 0
11*x^7*y^8 = 0
11*x^7*y^8 = 0
11*x^7*y^8 = 0 // : 11*y^8
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
(16*x^13*y^19)/(11*x^7*y^8) = 0
16/11*x^6*y^11 = 0 // : 16/11*y^11
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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