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D( x )
x/160 <= 0
x/160 <= 0
x/160 <= 0
1/160*x+0 <= 0 // - 0
1/160*x <= 0 // : 1/160
x <= 0/1/160
x <= 0
x in (0:+oo)
ln(x/160) = 2.772 // - 2.772
ln(x/160)-2.772 = 0
ln(x/160)-2.772 = 0 // + 2.772
ln(x/160) = 2.772
ln(x/160) = ln(e^2.772)
x/160 = e^2.772
x/160-e^2.772 = 0
1/160*x-e^2.772 = 0 // + e^2.772
1/160*x = e^2.772 // : 1/160
x = (e^2.772)/1/160
x = 160*e^2.772
x = 160*e^2.772
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