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D( x )
5*x^5*y^7 = 0
5*x^5*y^7 = 0
5*x^5*y^7 = 0
5*x^5*y^7 = 0 // : 5*y^7
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^3*(((5*x^5*y^7)^-2)/10)*y^5 = 0
1/250*x^-7*y^-9 = 0 // : 1/250*y^-9
x^-7 = 0
x należy do O
x belongs to the empty set
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