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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
16/t = 20/13.5 // - 20/13.5
16/t-(20/13.5) = 0
16/t-1.48148148 = 0
16*t^-1 = 1.48148148 // : 16
t^-1 = 0.09259259
-1 < 0
1/(t^1) = 0.09259259 // * t^1
1 = 0.09259259*t^1 // : 0.09259259
10.8000003 = t^1
t = 10.8000003
t = 10.8000003
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