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t in (-oo:+oo)
(2*t^2)/3-t = 1/6 // - 1/6
(2*t^2)/3-t-(1/6) = 0
(2*t^2)/3-t-1/6 = 0
2/3*t^2-t-1/6 = 0
DELTA = (-1)^2-(-1/6*2/3*4)
DELTA = 13/9
DELTA > 0
t = ((13/9)^(1/2)+1)/(2/3*2) or t = (1-(13/9)^(1/2))/(2/3*2)
t = 3/4*((13/9)^(1/2)+1) or t = 3/4*(1-(13/9)^(1/2))
t in { 3/4*(1-(13/9)^(1/2)), 3/4*((13/9)^(1/2)+1) }
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