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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
26/21 = 44/t // - 44/t
26/21-(44/t) = 0
26/21-44*t^-1 = 0
-44*t^-1 = -26/21 // : -44
t^-1 = 13/462
-1 < 0
1/(t^1) = 13/462 // * t^1
1 = 13/462*t^1 // : 13/462
462/13 = t^1
t = 462/13
t = 462/13
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