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t in (-oo:+oo)
((15*e^1)/10)*t = 3 // - 3
((15*e^1)/10)*t-3 = 0
((15*e)/10)*t-3 = 0
((3*e)/2)*t-3 = 0 // + 3
((3*e)/2)*t = 3 // : (3*e)/2
t = 3/((3*e)/2)
t = 2*e^-1
t = 2*e^-1
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