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