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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1/3-((8/3)*t) = 7/t // - 7/t
1/3-((8/3)*t)-(7/t) = 0
(-8/3)*t-7*t^-1+1/3 = 0
1/3*t^0-8/3*t^1-7*t^-1 = 0
(1/3*t^1-8/3*t^2-7*t^0)/(t^1) = 0 // * t^2
t^1*(1/3*t^1-8/3*t^2-7*t^0) = 0
t^1
(-8/3)*t^2+(1/3)*t-7 = 0
(-8/3)*t^2+(1/3)*t-7 = 0
DELTA = (1/3)^2-(-7*4*(-8/3))
DELTA = -671/9
DELTA < 0
t in { }
t belongs to the empty set
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