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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x*((-6*x^-10*x^-2*((-8*x^6*y^-3)/3)*y^-5*y)/(-4)) = 0
-4*x^-5*y^-7 = 0 // : -4*y^-7
x^-5 = 0
x należy do O
x belongs to the empty set
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