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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(((4*x)^-3)/6)*x^4 = 0
1/384*x = 0 // : 1/384
x = 0
x in { 0}
x belongs to the empty set
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