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