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D( t )
14*t+3 = 0
14*t+3 = 0
14*t+3 = 0
14*t+3 = 0 // - 3
14*t = -3 // : 14
t = -3/14
t in (-oo:-3/14) U (-3/14:+oo)
(3*t-6)/(14*t+3) = 0
3*t-6 = 0 // + 6
3*t = 6 // : 3
t = 6/3
t = 2
t = 2
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