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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
14/t = 10/11 // - 10/11
14/t-(10/11) = 0
14/t-10/11 = 0
14*t^-1 = 10/11 // : 14
t^-1 = 5/77
-1 < 0
1/(t^1) = 5/77 // * t^1
1 = 5/77*t^1 // : 5/77
77/5 = t^1
t = 77/5
t = 77/5
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