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