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D( x )
((15*w^-2*x^4)/10)*x^4*y^-6 = 0
((15*w^-2*x^4)/10)*x^4*y^-6 = 0
((15*w^-2*x^4)/10)*x^4*y^-6 = 0
3/2*w^-2*x^8*y^-6 = 0 // : 3/2*w^-2*y^-6
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((15*w^-2*x^4)/10)*x^4*y^-6)^-5 = 0
32/243*w^10*x^-40*y^30 = 0 // : 32/243*w^10*y^30
x^-40 = 0
x należy do O
x belongs to the empty set
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