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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*x^-4*y^-3)/8)*z^-3 = 0
3/8*x^-4*y^-3*z^-3 = 0 // : 3/8*y^-3*z^-3
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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