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D( t )
t/6 <= 0
t/6 <= 0
t/6 <= 0
1/6*t+0 <= 0 // - 0
1/6*t <= 0 // : 1/6
t <= 0/1/6
t <= 0
t in (0:+oo)
ln(t/6) = 0
ln(t/6) = ln(e^0)
t/6 = e^0
t/6-e^0 = 0
1/6*t-1 = 0 // + 1
1/6*t = 1 // : 1/6
t = 1/1/6
t = 6
t = 6
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