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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/7 = 4/t // - 4/t
3/7-(4/t) = 0
3/7-4*t^-1 = 0
-4*t^-1 = -3/7 // : -4
t^-1 = 3/28
-1 < 0
1/(t^1) = 3/28 // * t^1
1 = 3/28*t^1 // : 3/28
28/3 = t^1
t = 28/3
t = 28/3
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