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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((54*x^-3*y^9*z^7)^1)/3 = 0
(54*x^-3*y^9*z^7)/3 = 0
18*x^-3*y^9*z^7 = 0 // : 18*y^9*z^7
x^-3 = 0
x należy do O
x belongs to the empty set
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