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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
34/9 = 102/t // - 102/t
34/9-(102/t) = 0
34/9-102*t^-1 = 0
-102*t^-1 = -34/9 // : -102
t^-1 = 1/27
-1 < 0
1/(t^1) = 1/27 // * t^1
1 = 1/27*t^1 // : 1/27
27 = t^1
t = 27
t = 27
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