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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-3*((12*x^2*y^-3)/9)*y^5 = 0
4/3*x^-1*y^2 = 0 // : 4/3*y^2
x^-1 = 0
x należy do O
x belongs to the empty set
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