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D( x )
(1/3)*x-5 <= 0
(1/3)*x-5 <= 0
(1/3)*x-5 <= 0
1/3*x-5 <= 0 // + 5
1/3*x <= 5 // : 1/3
x <= 5/1/3
x <= 15
x in (15:+oo)
ln((1/3)*x-5) < 0
ln((1/3)*x-5)+0 < 0 // - 0
ln((1/3)*x-5) < 0
ln((1/3)*x-5) in (-oo:0)
ln((1/3)*x-5) < ln(e^0)
(1/3)*x-5 < e^0
(1/3)*x-e^0-5 < 0
1/3*x-6 < 0 // + 6
1/3*x < 6 // : 1/3
x < 6/1/3
x < 18
x in (15:18)
(15:18)
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