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D( x )
(2*x)/2 <= 0
(2*x)/2 <= 0
(2*x)/2 <= 0
x+0 <= 0 // - 0
x <= 0
x in (0:+oo)
ln((2*x)/2) = 0
ln((2*x)/2) = ln(e^0)
(2*x)/2 = e^0
(2*x)/2-e^0 = 0
x-1 = 0 // + 1
x = 1
x = 1
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