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D( t )
(5*t)/2 = 0
(5*t)/2 = 0
(5*t)/2 = 0
5/2*t = 0 // : 5/2
t = 0
t in (-oo:0) U (0:+oo)
(20/9)/((5*t)/2) = 0
8/9*t^-1 = 0 // : 8/9
t^-1 = 0
t naleu017Cy do O
t belongs to the empty set
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