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D( t )
3*t-6 = 0
3*t-6 = 0
3*t-6 = 0
3*t-6 = 0 // + 6
3*t = 6 // : 3
t = 6/3
t = 2
t in (-oo:2) U (2:+oo)
(7*t)/(3*t-6) = 0
7*t = 0 // : 7
t = 0
t = 0
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