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D( t )
7*t+6 = 0
7*t+6 = 0
7*t+6 = 0
7*t+6 = 0 // - 6
7*t = -6 // : 7
t = -6/7
t in (-oo:-6/7) U (-6/7:+oo)
(2-(4*t))/(7*t+6) = 0
(2-4*t)/(7*t+6) = 0
2-4*t = 0 // - 2
-4*t = -2 // : -4
t = -2/(-4)
t = 1/2
t = 1/2
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