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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-7*((6*x^-4*y^3)/4)*y^-4)^2 = 0
9/4*x^-22*y^-2 = 0 // : 9/4*y^-2
x^-22 = 0
x należy do O
x belongs to the empty set
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