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t in (-oo:+oo)
(2/3)*t^2 = 6 // - 6
(2/3)*t^2-6 = 0
2/3*t^2 = 6 // : 2/3
t^2 = 9
t^2 = 9 // ^ 1/2
abs(t) = 3
t = 3 or t = -3
t in { 3, -3 }
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