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D( x )
e^2 = 0
e^2 = 0
e^2 = 0
e^2 = 0
x belongs to the empty set
x in (-oo:+oo)
((e^5*x)/(e^2))*x = e^12 // - e^12
((e^5*x)/(e^2))*x-e^12 = 0
e^3*x^2 = e^12 // : e^3
x^2 = e^9
x^2 = e^9 // ^ 1/2
abs(x) = e^(9/2)
x = e^(9/2) or x = -e^(9/2)
x in { e^(9/2), -e^(9/2) }
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