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D( x )
27*x = 0
27*x = 0
27*x = 0
27*x = 0 // : 27
x = 0
x in (-oo:0) U (0:+oo)
(45*x^5)/(27*x) = 0
5/3*x^4 = 0 // : 5/3
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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