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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
27/84 = 18/t // - 18/t
27/84-(18/t) = 0
27/84-18*t^-1 = 0
-18*t^-1 = -9/28 // : -18
t^-1 = 1/56
-1 < 0
1/(t^1) = 1/56 // * t^1
1 = 1/56*t^1 // : 1/56
56 = t^1
t = 56
t = 56
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