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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
14/9 = 28/t // - 28/t
14/9-(28/t) = 0
14/9-28*t^-1 = 0
-28*t^-1 = -14/9 // : -28
t^-1 = 1/18
-1 < 0
1/(t^1) = 1/18 // * t^1
1 = 1/18*t^1 // : 1/18
18 = t^1
t = 18
t = 18
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