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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) = 1.2 // - 1.2
ln(t/6)-1.2 = 0
ln(t/6)-1.2 = 0 // + 1.2
ln(t/6) = 1.2
ln(t/6) = ln(e^1.2)
t/6 = e^1.2
t/6-e^1.2 = 0
1/6*t-e^1.2 = 0 // + e^1.2
1/6*t = e^1.2 // : 1/6
t = (e^1.2)/1/6
t = 6*e^1.2
t = 6*e^1.2
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