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D( x )
(8*x)/27 = 0
(8*x)/27 = 0
(8*x)/27 = 0
8/27*x = 0 // : 8/27
x = 0
x in (-oo:0) U (0:+oo)
((4*x)/9)/((8*x)/27) = 0
3/2 = 0
x belongs to the empty set
x belongs to the empty set
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