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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
16/t-11 = 4/11 // - 4/11
16/t-(4/11)-11 = 0
16/t-4/11-11 = 0
16*t^-1 = 125/11 // : 16
t^-1 = 125/176
-1 < 0
1/(t^1) = 125/176 // * t^1
1 = 125/176*t^1 // : 125/176
176/125 = t^1
t = 176/125
t = 176/125
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