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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
63/t = 24/4.8 // - 24/4.8
63/t-(24/4.8) = 0
63/t-5 = 0
63*t^-1 = 5 // : 63
t^-1 = 5/63
-1 < 0
1/(t^1) = 5/63 // * t^1
1 = 5/63*t^1 // : 5/63
63/5 = t^1
t = 63/5
t = 63/5
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