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D( t )
t-6 = 0
t-6 = 0
t-6 = 0
t-6 = 0 // + 6
t = 6
t in (-oo:6) U (6:+oo)
11/(t-6) = 7/3 // - 7/3
11/(t-6)-(7/3) = 0
11/(t-6)-7/3 = 0
(3*11)/(3*(t-6))+(-7*(t-6))/(3*(t-6)) = 0
3*11-7*(t-6) = 0
75-7*t = 0
(75-7*t)/(3*(t-6)) = 0
(75-7*t)/(3*(t-6)) = 0 // * 3*(t-6)
75-7*t = 0
75-7*t = 0 // - 75
-7*t = -75 // : -7
t = -75/(-7)
t = 75/7
t = 75/7
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