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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9/t = -27 // + 27
9/t+27 = 0
9*t^-1 = -27 // : 9
t^-1 = -3
-1 < 0
1/(t^1) = -3 // * t^1
1 = -3*t^1 // : -3
-1/3 = t^1
t = -1/3
t = -1/3
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