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t in (-oo:+oo)
(4*t^2)/5 = t/5+3 // - t/5+3
(4*t^2)/5-(t/5)-3 = 0
4/5*t^2-1/5*t-3 = 0
DELTA = (-1/5)^2-(-3*4/5*4)
DELTA = 241/25
DELTA > 0
t = ((241/25)^(1/2)+1/5)/(4/5*2) or t = (1/5-(241/25)^(1/2))/(4/5*2)
t = 5/8*((241/25)^(1/2)+1/5) or t = 5/8*(1/5-(241/25)^(1/2))
t in { 5/8*(1/5-(241/25)^(1/2)), 5/8*((241/25)^(1/2)+1/5) }
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