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D( x )
2*x^(10^4) = 0
2*x^(10^4) = 0
2*x^(10^4) = 0
2*x^10000 = 0 // : 2
x^10000 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6.2*x^(10^14))/(2*x^(10^4)) = 0
3.1*x^99999999990000 = 0 // : 3.1
x^99999999990000 = 0
x = 0
x in { 0}
x belongs to the empty set
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