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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
95 = 152/t // - 152/t
95-(152/t) = 0
95-152*t^-1 = 0
-152*t^-1 = -95 // : -152
t^-1 = 5/8
-1 < 0
1/(t^1) = 5/8 // * t^1
1 = 5/8*t^1 // : 5/8
8/5 = t^1
t = 8/5
t = 8/5
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