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t in (-oo:+oo)
(1/3)*e^2*t = 5 // - 5
(1/3)*e^2*t-5 = 0
1/3*e^2*t-5 = 0 // + 5
1/3*e^2*t = 5 // : 1/3*e^2
t = 5/(1/3*e^2)
t = 15*e^-2
t = 15*e^-2
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