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t in (-oo:+oo)
(1/3)*t^2+3 = 2*t // - 2*t
(1/3)*t^2-(2*t)+3 = 0
(1/3)*t^2-2*t+3 = 0
1/3*t^2-2*t+3 = 0
DELTA = (-2)^2-(1/3*3*4)
DELTA = 0
t = 2/(1/3*2)
t = 3 or t = 3
t in { 3, 3 }
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