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D( x )
x/30 <= 0
x/30 <= 0
x/30 <= 0
1/30*x+0 <= 0 // - 0
1/30*x <= 0 // : 1/30
x <= 0/1/30
x <= 0
x in (0:+oo)
ln(x/30) = 0
ln(x/30) = ln(e^0)
x/30 = e^0
x/30-e^0 = 0
1/30*x-1 = 0 // + 1
1/30*x = 1 // : 1/30
x = 1/1/30
x = 30
x = 30
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