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D( x )
x = 0
x^-6*y^-4*z^-9 = 0
(x^6*y^4*z^9)/(x^-6*y^-4*z^-9) = 0
x = 0
x = 0
x^-6*y^-4*z^-9 = 0
x^-6*y^-4*z^-9 = 0
x^-6*y^-4*z^-9 = 0 // : y^-4*z^-9
x^-6 = 0
x należy do O
(x^6*y^4*z^9)/(x^-6*y^-4*z^-9) = 0
(x^6*y^4*z^9)/(x^-6*y^-4*z^-9) = 0
x^12*y^8*z^18 = 0 // : y^8*z^18
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^6*y^4*z^9)/(x^-6*y^-4*z^-9))^-3 = 0
x^-36*y^-24*z^-54 = 0 // : y^-24*z^-54
x^-36 = 0
x należy do O
x belongs to the empty set
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