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t in (-oo:+oo)
(6*t^2)/5+(7*t^1)/5+2 = 0
(6*t^2)/5+(7*t)/5+2 = 0
6/5*t^2+7/5*t+2 = 0
DELTA = (7/5)^2-(6/5*2*4)
DELTA = -191/25
DELTA < 0
t belongs to the empty set
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