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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
12/t = 8/3 // - 8/3
12/t-(8/3) = 0
12/t-8/3 = 0
12*t^-1 = 8/3 // : 12
t^-1 = 2/9
-1 < 0
1/(t^1) = 2/9 // * t^1
1 = 2/9*t^1 // : 2/9
9/2 = t^1
t = 9/2
t = 9/2
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