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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8-(12/t) = 1/3 // - 1/3
8-(12/t)-(1/3) = 0
8-12*t^-1-1/3 = 0
-12*t^-1 = -23/3 // : -12
t^-1 = 23/36
-1 < 0
1/(t^1) = 23/36 // * t^1
1 = 23/36*t^1 // : 23/36
36/23 = t^1
t = 36/23
t = 36/23
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