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t in (-oo:+oo)
(t^2)/2+3*t-(1/6) = 0
(t^2)/2+3*t-1/6 = 0
1/2*t^2+3*t-1/6 = 0
DELTA = 3^2-(-1/6*1/2*4)
DELTA = 28/3
DELTA > 0
t = ((28/3)^(1/2)-3)/(1/2*2) or t = (-(28/3)^(1/2)-3)/(1/2*2)
t = (28/3)^(1/2)-3 or t = -((28/3)^(1/2)+3)
t in { -((28/3)^(1/2)+3), (28/3)^(1/2)-3 }
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