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t in (-oo:+oo)
((-4/5)*t^2)/5 = 2/3 // - 2/3
((-4/5)*t^2)/5-(2/3) = 0
((-4/5)*t^2)/5-2/3 = 0
-4/25*t^2 = 2/3 // : -4/25
t^2 = -25/6
t belongs to the empty set
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