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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/x)*x*((4*x^6)/9) = 0
20/9*x^6 = 0 // : 20/9
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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