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D( x )
x = 0
8*x^-3*y^9 = 0
x = 0
x = 0
8*x^-3*y^9 = 0
8*x^-3*y^9 = 0
8*x^-3*y^9 = 0 // : 8*y^9
x^-3 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((8*x^-3*y^9)^-2)/3 = 0
1/192*x^6*y^-18 = 0 // : 1/192*y^-18
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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