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t in (-oo:+oo)
t^2-((2.5/(-4.9))*t) = 0
t^2+0.51020408*t = 0
t^2+0.51020408*t = 0
DELTA = 0.51020408^2-(0*1*4)
DELTA = 0.51020408^2
DELTA = 0.2603082
DELTA > 0
t = ((0.51020408^2)^(1/2)-0.51020408)/(1*2) or t = (-(0.51020408^2)^(1/2)-0.51020408)/(1*2)
t = 0 or t = -0.51020408
t in { -0.51020408, 0 }
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