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D( x )
6*x^(10^10) = 0
6*x^(10^10) = 0
6*x^(10^10) = 0
6*x^10000000000 = 0 // : 6
x^10000000000 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*3*6*x^(10^2)*x^(10^9)*x^(10^13))/(6*x^(10^10)) = 0
9*x^9991000000100 = 0 // : 9
x^9991000000100 = 0
x = 0
x in { 0}
x belongs to the empty set
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