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