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t in (-oo:+oo)
(1/6)*t^2-((4/3)*t)+2 = 0
(1/6)*t^2+(-4/3)*t+2 = 0
1/6*t^2-4/3*t+2 = 0
DELTA = (-4/3)^2-(1/6*2*4)
DELTA = 4/9
DELTA > 0
t = ((4/9)^(1/2)+4/3)/(1/6*2) or t = (4/3-(4/9)^(1/2))/(1/6*2)
t = 6 or t = 2
t in { 2, 6 }
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