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D( t )
e^-0.4*t-0.684 = 0
e^-0.4*t-0.684 = 0
e^-0.4*t-0.684 = 0
e^-0.4*t-0.684 = 0 // + 0.684
e^-0.4*t = 0.684 // : e^-0.4
t = 0.684/(e^-0.4)
t in (-oo:0.684/(e^-0.4)) U (0.684/(e^-0.4):+oo)
(e^-0.6*t-1.026)/(e^-0.4*t-0.684) = 1.534 // - 1.534
(e^-0.6*t-1.026)/(e^-0.4*t-0.684)-1.534 = 0
(e^-0.6*t-1.026)/(e^-0.4*t-0.684)+(-1.534*(e^-0.4*t-0.684))/(e^-0.4*t-0.684) = 0
e^-0.6*t-1.534*(e^-0.4*t-0.684)-1.026 = 0
(e^-0.6-1.534*e^-0.4)*t+0.023256 = 0
((e^-0.6-1.534*e^-0.4)*t+0.023256)/(e^-0.4*t-0.684) = 0
((e^-0.6-1.534*e^-0.4)*t+0.023256)/(e^-0.4*t-0.684) = 0 // * e^-0.4*t-0.684
(e^-0.6-1.534*e^-0.4)*t+0.023256 = 0
(e^-0.6-1.534*e^-0.4)*t+0.023256 = 0 // - 0.023256
(e^-0.6-1.534*e^-0.4)*t = -0.023256 // : e^-0.6-1.534*e^-0.4
t = -0.023256/(e^-0.6-1.534*e^-0.4)
t = -0.023256/(e^-0.6-1.534*e^-0.4)
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