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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
25/6 = 125/t // - 125/t
25/6-(125/t) = 0
25/6-125*t^-1 = 0
-125*t^-1 = -25/6 // : -125
t^-1 = 1/30
-1 < 0
1/(t^1) = 1/30 // * t^1
1 = 1/30*t^1 // : 1/30
30 = t^1
t = 30
t = 30
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