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t in (-oo:+oo)
2.5*(1/2)*t^2 = 10*t // - 10*t
2.5*(1/2)*t^2-(10*t) = 0
2.5*(1/2)*t^2-10*t = 0
1.25*t^2-10*t = 0
DELTA = (-10)^2-(0*1.25*4)
DELTA = 100
DELTA > 0
t = (100^(1/2)+10)/(1.25*2) or t = (10-100^(1/2))/(1.25*2)
t = 8 or t = 0
t in { 0, 8 }
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