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D( t )
t-5 = 0
t-5 = 0
t-5 = 0
t-5 = 0 // + 5
t = 5
t in (-oo:5) U (5:+oo)
8/(t-5) = 2 // - 2
8/(t-5)-2 = 0
8/(t-5)+(-2*(t-5))/(t-5) = 0
8-2*(t-5) = 0
18-2*t = 0
(18-2*t)/(t-5) = 0
(18-2*t)/(t-5) = 0 // * t-5
18-2*t = 0
18-2*t = 0 // - 18
-2*t = -18 // : -2
t = -18/(-2)
t = 9
t = 9
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