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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
10/30 = 6/t // - 6/t
10/30-(6/t) = 0
10/30-6*t^-1 = 0
-6*t^-1 = -1/3 // : -6
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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