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