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t in (-oo:+oo)
(t^2)/2+8*t = 0
1/2*t^2+8*t = 0
DELTA = 8^2-(0*1/2*4)
DELTA = 64
DELTA > 0
t = (64^(1/2)-8)/(1/2*2) or t = (-64^(1/2)-8)/(1/2*2)
t = 0 or t = -16
t in { -16, 0 }
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