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t in (-oo:+oo)
(t^2)/3 = 9 // - 9
(t^2)/3-9 = 0
1/3*t^2 = 9 // : 1/3
t^2 = 27
t^2 = 27 // ^ 1/2
abs(t) = 3*3^(1/2)
t = 3*3^(1/2) or t = -(3*3^(1/2))
t in { 3*3^(1/2), -(3*3^(1/2)) }
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