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t in (-oo:+oo)
t^2-(25/4) = 0
t^2-25/4 = 0
1*t^2 = 25/4 // : 1
t^2 = 25/4
t^2 = 25/4 // ^ 1/2
abs(t) = 5/2
t = 5/2 or t = -5/2
t in { 5/2, -5/2 }
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