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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)
((-x)^2)^3*((4*(-5*x)^2*x^6)/(10*x)) = 0
10*x^13 = 0 // : 10
x^13 = 0
x = 0
x in { 0}
x belongs to the empty set
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