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