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t in (-oo:+oo)
3*t^2-(2/3) = 2 // - 2
3*t^2-(2/3)-2 = 0
3*t^2-2/3-2 = 0
3*t^2 = 8/3 // : 3
t^2 = 8/9
t^2 = 8/9 // ^ 1/2
abs(t) = (8/9)^(1/2)
t = (8/9)^(1/2) or t = -(8/9)^(1/2)
t in { (8/9)^(1/2), -(8/9)^(1/2) }
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