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