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D( t )
29*e^-1.35*t+1 = 0
29*e^-1.35*t+1 = 0
29*e^-1.35*t+1 = 0
29*e^-1.35*t+1 = 0 // - 1
29*e^-1.35*t = -1 // : 29*e^-1.35
t = -1/(29*e^-1.35)
t in (-oo:-1/(29*e^-1.35)) U (-1/(29*e^-1.35):+oo)
20000 = 30/(29*e^-1.35*t+1) // - 30/(29*e^-1.35*t+1)
20000-(30/(29*e^-1.35*t+1)) = 0
20000-30*(29*e^-1.35*t+1)^-1 = 0
20000-30/(29*e^-1.35*t+1) = 0
(20000*(29*e^-1.35*t+1))/(29*e^-1.35*t+1)-30/(29*e^-1.35*t+1) = 0
20000*(29*e^-1.35*t+1)-30 = 0
580000*e^-1.35*t+19970 = 0
(580000*e^-1.35*t+19970)/(29*e^-1.35*t+1) = 0
(580000*e^-1.35*t+19970)/(29*e^-1.35*t+1) = 0 // * 29*e^-1.35*t+1
580000*e^-1.35*t+19970 = 0
580000*e^-1.35*t+19970 = 0 // - 19970
580000*e^-1.35*t = -19970 // : 580000*e^-1.35
t = -19970/(580000*e^-1.35)
t = (-1997*e^1.35)/58000
t = (-1997*e^1.35)/58000
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