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D( x )
((45*x^5*y^-8)/9)*z^-2 = 0
((45*x^5*y^-8)/9)*z^-2 = 0
((45*x^5*y^-8)/9)*z^-2 = 0
5*x^5*y^-8*z^-2 = 0 // : 5*y^-8*z^-2
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((45*x^5*y^-8)/9)*z^-2)^-3 = 0
1/125*x^-15*y^24*z^6 = 0 // : 1/125*y^24*z^6
x^-15 = 0
x naleu017Cy do O
x belongs to the empty set
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