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D( x )
x*((5*y^-4)/3) = 0
x*((5*y^-4)/3) = 0
x*((5*y^-4)/3) = 0
5/3*x*y^-4 = 0 // : 5/3*y^-4
x = 0
x in (-oo:0) U (0:+oo)
(x*((5*y^-4)/3))^-3 = 0
27/125*x^-3*y^12 = 0 // : 27/125*y^12
x^-3 = 0
x należy do O
x belongs to the empty set
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