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t in (-oo:+oo)
((-t)^2)/18 = ln(0.5) // - ln(0.5)
((-t)^2)/18-ln(0.5) = 0
1/18*t^2 = ln(0.5) // : 1/18
t^2 = 18*ln(0.5)
t belongs to the empty set
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