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D( x )
x/0.25 <= 0
x/0.25 <= 0
x/0.25 <= 0
4*x+0 <= 0 // - 0
4*x <= 0 // : 4
x <= 0/4
x <= 0
x in (0:+oo)
ln(x/0.25) = -2.5 // + 2.5
ln(x/0.25)+2.5 = 0
ln(x/0.25)+2.5 = 0 // - 2.5
ln(x/0.25) = -2.5
ln(x/0.25) = ln(e^-2.5)
x/0.25 = e^-2.5
x/0.25-e^-2.5 = 0
4*x-e^-2.5 = 0 // + e^-2.5
4*x = e^-2.5 // : 4
x = (e^-2.5)/4
x = (e^-2.5)/4
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