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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
16/10 = 56/t // - 56/t
16/10-(56/t) = 0
16/10-56*t^-1 = 0
-56*t^-1 = -8/5 // : -56
t^-1 = 1/35
-1 < 0
1/(t^1) = 1/35 // * t^1
1 = 1/35*t^1 // : 1/35
35 = t^1
t = 35
t = 35
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