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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-2*y^4*((12*x^-3*y^5*z^7)/4)*z^6 = 0
3*x^-5*y^9*z^13 = 0 // : 3*y^9*z^13
x^-5 = 0
x należy do O
x belongs to the empty set
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