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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
18/16 = 27/t // - 27/t
18/16-(27/t) = 0
18/16-27*t^-1 = 0
-27*t^-1 = -9/8 // : -27
t^-1 = 1/24
-1 < 0
1/(t^1) = 1/24 // * t^1
1 = 1/24*t^1 // : 1/24
24 = t^1
t = 24
t = 24
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