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D( x )
10*x = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
x in (-oo:0) U (0:+oo)
(15*x^2)/(10*x) = 0
3/2*x = 0 // : 3/2
x = 0
x in { 0}
x belongs to the empty set
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