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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5/9 = 12/t // - 12/t
5/9-(12/t) = 0
5/9-12*t^-1 = 0
-12*t^-1 = -5/9 // : -12
t^-1 = 5/108
-1 < 0
1/(t^1) = 5/108 // * t^1
1 = 5/108*t^1 // : 5/108
108/5 = t^1
t = 108/5
t = 108/5
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