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t in (-oo:+oo)
t^2-((3/5)*t)+9/100 = 0
t^2+(-3/5)*t+9/100 = 0
t^2-3/5*t+9/100 = 0
DELTA = (-3/5)^2-(9/100*1*4)
DELTA = 0
t = 3/5/(1*2)
t = 3/10 or t = 3/10
t in { 3/10, 3/10 }
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