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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5/t = 0.3/0.5 // - 0.3/0.5
5/t-(0.3/0.5) = 0
5/t-0.6 = 0
5*t^-1 = 0.6 // : 5
t^-1 = 0.12
-1 < 0
1/(t^1) = 0.12 // * t^1
1 = 0.12*t^1 // : 0.12
8.33333333 = t^1
t = 8.33333333
t = 8.33333333
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