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