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t in (-oo:+oo)
(1/5)*t^2-16 = 0
1/5*t^2 = 16 // : 1/5
t^2 = 80
t^2 = 80 // ^ 1/2
abs(t) = 4*5^(1/2)
t = 4*5^(1/2) or t = -(4*5^(1/2))
t in { 4*5^(1/2), -(4*5^(1/2)) }
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