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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
22/6 = 88/t // - 88/t
22/6-(88/t) = 0
22/6-88*t^-1 = 0
-88*t^-1 = -11/3 // : -88
t^-1 = 1/24
-1 < 0
1/(t^1) = 1/24 // * t^1
1 = 1/24*t^1 // : 1/24
24 = t^1
t = 24
t = 24
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