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D( x )
x^8 = 0
x^8 = 0
x^8 = 0
1*x^8 = 0 // : 1
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8/(x^8))*((9*x^3)/2) = 0
36*x^-5 = 0 // : 36
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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