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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t/t-(18/t)-18-18 = 0
t/t-18*t^-1-18-18 = 0
-18*t^-1 = 35 // : -18
t^-1 = -35/18
-1 < 0
1/(t^1) = -35/18 // * t^1
1 = -35/18*t^1 // : -35/18
-18/35 = t^1
t = -18/35
t = -18/35
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