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D( t )
t-3 = 0
t-3 = 0
t-3 = 0
t-3 = 0 // + 3
t = 3
t in (-oo:3) U (3:+oo)
5/(t-3) = 10 // - 10
5/(t-3)-10 = 0
5/(t-3)+(-10*(t-3))/(t-3) = 0
5-10*(t-3) = 0
35-10*t = 0
(35-10*t)/(t-3) = 0
(35-10*t)/(t-3) = 0 // * t-3
35-10*t = 0
35-10*t = 0 // - 35
-10*t = -35 // : -10
t = -35/(-10)
t = 7/2
t = 7/2
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