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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
22/18 = 99/t // - 99/t
22/18-(99/t) = 0
22/18-99*t^-1 = 0
-99*t^-1 = -11/9 // : -99
t^-1 = 1/81
-1 < 0
1/(t^1) = 1/81 // * t^1
1 = 1/81*t^1 // : 1/81
81 = t^1
t = 81
t = 81
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