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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6/8 = 27/t // - 27/t
6/8-(27/t) = 0
6/8-27*t^-1 = 0
-27*t^-1 = -3/4 // : -27
t^-1 = 1/36
-1 < 0
1/(t^1) = 1/36 // * t^1
1 = 1/36*t^1 // : 1/36
36 = t^1
t = 36
t = 36
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