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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
24/t = 3/5 // - 3/5
24/t-(3/5) = 0
24/t-3/5 = 0
24*t^-1 = 3/5 // : 24
t^-1 = 1/40
-1 < 0
1/(t^1) = 1/40 // * t^1
1 = 1/40*t^1 // : 1/40
40 = t^1
t = 40
t = 40
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