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D( x )
e^3 = 0
e^3 = 0
e^3 = 0
e^3 = 0
x belongs to the empty set
x in (-oo:+oo)
x*(((e^5*x)^5)/(e^3)) = 0
e^22*x^6 = 0 // : e^22
x^6 = 0
x = 0
x = 0
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