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D( x )
x <= 0
x <= 0
x in (0:+oo)
5/1-ln(x) = 0
5-ln(x) = 0
5-ln(x) = 0 // - 5
-ln(x) = -5
-ln(x) = -5 // * -1
ln(x) = ln(e^5)
x = e^5
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