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