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t in (-oo:+oo)
5*t^2-(5*t)-(30/(-7)) = 0
5*t^2-5*t+30/7 = 0
5*t^2-5*t+30/7 = 0
DELTA = (-5)^2-(4*30/7*5)
DELTA = -425/7
DELTA < 0
t belongs to the empty set
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