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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = 5/2-e^7 // - 5/2-e^7
ln(x)+e^7-(5/2) = 0
ln(x)+e^7-5/2 = 0
ln(x)+e^7-5/2 = 0 // - e^7-5/2
ln(x) = -(e^7-5/2)
ln(x) = 5/2-e^7
ln(x) = ln(e^(5/2-e^7))
x = e^(5/2-e^7)
x = 0
x in { 0}
x belongs to the empty set
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