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D( x )
x^3*y^7 = 0
x = 0
x^3*y^7 = 0
x^3*y^7 = 0
x^3*y^7 = 0 // : y^7
x^3 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-1*y^3)/(x^3*y^7))^2 = 0
x^-8*y^-8 = 0 // : y^-8
x^-8 = 0
x należy do O
x belongs to the empty set
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