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D( x )
9*x^2 = 0
9*x^2 = 0
9*x^2 = 0
9*x^2 = 0 // : 9
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(15*x^2)/(9*x^2) = 0
5/3 = 0
x belongs to the empty set
x belongs to the empty set
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