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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4.5/t = 12/15.2 // - 12/15.2
4.5/t-(12/15.2) = 0
4.5/t-0.78947368 = 0
4.5*t^-1 = 0.78947368 // : 4.5
t^-1 = 0.1754386
-1 < 0
1/(t^1) = 0.1754386 // * t^1
1 = 0.1754386*t^1 // : 0.1754386
5.69999989 = t^1
t = 5.69999989
t = 5.69999989
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