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D( x )
2*x^(10^3) = 0
2*x^(10^3) = 0
2*x^(10^3) = 0
2*x^1000 = 0 // : 2
x^1000 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8.5*x^(10^6))/(2*x^(10^3)) = 0
4.25*x^999000 = 0 // : 4.25
x^999000 = 0
x = 0
x in { 0}
x belongs to the empty set
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