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D( t )
10*t-3 = 0
10*t-3 = 0
10*t-3 = 0
10*t-3 = 0 // + 3
10*t = 3 // : 10
t = 3/10
t in (-oo:3/10) U (3/10:+oo)
(3*t-8)/(10*t-3) = 0
3*t-8 = 0 // + 8
3*t = 8 // : 3
t = 8/3
t = 8/3
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