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D( t )
5*t = 0
5*t = 0
5*t = 0
5*t = 0 // : 5
t = 0
t in (-oo:0) U (0:+oo)
(5*t^2-(30*t))/(5*t) = 0
(5*t^2-30*t)/(5*t) = 0
5*t^2-30*t = 0
5*t*(t-6) = 0
t-6 = 0 // + 6
t = 6
5*t*(t-6) = 0
t-6 = 0
t-6 = 0 // + 6
t = 6
t = 6
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