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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
29/6 = 87/t // - 87/t
29/6-(87/t) = 0
29/6-87*t^-1 = 0
-87*t^-1 = -29/6 // : -87
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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