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D( x )
((6*x^4)/5)*y = 0
((6*x^4)/5)*y = 0
((6*x^4)/5)*y = 0
6/5*x^4*y = 0 // : 6/5*y
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((6*x^4)/5)*y)^-2 = 0
25/36*x^-8*y^-2 = 0 // : 25/36*y^-2
x^-8 = 0
x należy do O
x belongs to the empty set
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