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t in (-oo:+oo)
t^2 = 9/25 // - 9/25
t^2-(9/25) = 0
t^2-9/25 = 0
1*t^2 = 9/25 // : 1
t^2 = 9/25
t^2 = 9/25 // ^ 1/2
abs(t) = 3/5
t = 3/5 or t = -3/5
t in { 3/5, -3/5 }
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