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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8/22 = 6/t // - 6/t
8/22-(6/t) = 0
8/22-6*t^-1 = 0
-6*t^-1 = -4/11 // : -6
t^-1 = 2/33
-1 < 0
1/(t^1) = 2/33 // * t^1
1 = 2/33*t^1 // : 2/33
33/2 = t^1
t = 33/2
t = 33/2
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