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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
24/5 = 120/t // - 120/t
24/5-(120/t) = 0
24/5-120*t^-1 = 0
-120*t^-1 = -24/5 // : -120
t^-1 = 1/25
-1 < 0
1/(t^1) = 1/25 // * t^1
1 = 1/25*t^1 // : 1/25
25 = t^1
t = 25
t = 25
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