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D( x )
x^3 = 0
(4*y^7)/(x^3) = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
(4*y^7)/(x^3) = 0
(4*y^7)/(x^3) = 0
4*x^-3*y^7 = 0 // : 4*y^7
x^-3 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((4*y^7)/(x^3))^-2 = 0
1/16*x^6*y^-14 = 0 // : 1/16*y^-14
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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