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