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t in (-oo:+oo)
(2/3)*t^2-t = -1/6 // + -1/6
(2/3)*t^2-t-(-1/6) = 0
(2/3)*t^2-t+1/6 = 0
2/3*t^2-t+1/6 = 0
DELTA = (-1)^2-(1/6*2/3*4)
DELTA = 5/9
DELTA > 0
t = ((5/9)^(1/2)+1)/(2/3*2) or t = (1-(5/9)^(1/2))/(2/3*2)
t = 3/4*((5/9)^(1/2)+1) or t = 3/4*(1-(5/9)^(1/2))
t in { 3/4*(1-(5/9)^(1/2)), 3/4*((5/9)^(1/2)+1) }
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