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t in (-oo:+oo)
60/5 = 8*t-t^2 // - 8*t-t^2
t^2-(8*t)+60/5 = 0
t^2-8*t+60/5 = 0
t^2-8*t+12 = 0
DELTA = (-8)^2-(1*4*12)
DELTA = 16
DELTA > 0
t = (16^(1/2)+8)/(1*2) or t = (8-16^(1/2))/(1*2)
t = 6 or t = 2
t in { 2, 6 }
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