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D( x )
x^15 = 0
x^15 = 0
x^15 = 0
1*x^15 = 0 // : 1
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
(y^11*((x^8*y^3*z^16)/(x^15))*z^9)^7 = 0
x^-49*y^98*z^175 = 0 // : y^98*z^175
x^-49 = 0
x naleu017Cy do O
x belongs to the empty set
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