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D( x )
x/5 <= 0
x/5 <= 0
x/5 <= 0
1/5*x+0 <= 0 // - 0
1/5*x <= 0 // : 1/5
x <= 0/1/5
x <= 0
x in (0:+oo)
ln(x/5) = 0
ln(x/5) = ln(e^0)
x/5 = e^0
x/5-e^0 = 0
1/5*x-1 = 0 // + 1
1/5*x = 1 // : 1/5
x = 1/1/5
x = 5
x = 5
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