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D( t )
3*t+2 = 0
3*t+2 = 0
3*t+2 = 0
3*t+2 = 0 // - 2
3*t = -2 // : 3
t = -2/3
t in (-oo:-2/3) U (-2/3:+oo)
(10*t+11)/(3*t+2) = 0
10*t+11 = 0 // - 11
10*t = -11 // : 10
t = -11/10
t = -11/10
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