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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
225/t-4 = 6.4 // - 6.4
225/t-6.4-4 = 0
225*t^-1 = 10.4 // : 225
t^-1 = 0.04622222
-1 < 0
1/(t^1) = 0.04622222 // * t^1
1 = 0.04622222*t^1 // : 0.04622222
21.63461642 = t^1
t = 21.63461642
t = 21.63461642
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