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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((16*w^2*x^-7*y^-2)/2)*w^2*x^-4*y = 0
8*w^4*x^-11*y^-1 = 0 // : 8*w^4*y^-1
x^-11 = 0
x należy do O
x belongs to the empty set
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