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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
10/2 = 35/t // - 35/t
10/2-(35/t) = 0
10/2-35*t^-1 = 0
-35*t^-1 = -5 // : -35
t^-1 = 1/7
-1 < 0
1/(t^1) = 1/7 // * t^1
1 = 1/7*t^1 // : 1/7
7 = t^1
t = 7
t = 7
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