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