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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6/t = 12/7 // - 12/7
6/t-(12/7) = 0
6/t-12/7 = 0
6*t^-1 = 12/7 // : 6
t^-1 = 2/7
-1 < 0
1/(t^1) = 2/7 // * t^1
1 = 2/7*t^1 // : 2/7
7/2 = t^1
t = 7/2
t = 7/2
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