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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
12/7 = 7/t // - 7/t
12/7-(7/t) = 0
12/7-7*t^-1 = 0
-7*t^-1 = -12/7 // : -7
t^-1 = 12/49
-1 < 0
1/(t^1) = 12/49 // * t^1
1 = 12/49*t^1 // : 12/49
49/12 = t^1
t = 49/12
t = 49/12
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