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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)
(10*t^2-t)/(5*t) = 0
10*t^2-t = 0
t*(10*t-1) = 0
10*t-1 = 0 // + 1
10*t = 1 // : 10
t = 1/10
t*(t-1/10) = 0
(t*(t-1/10))/(5*t) = 0
( t-1/10 )
t-1/10 = 0 // + 1/10
t = 1/10
( t )
t = 0
t in { 0}
t = 1/10
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