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