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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
-2/5 = 6/t // - 6/t
-(6/t)-2/5 = 0
-6*t^-1-2/5 = 0
-6*t^-1 = 2/5 // : -6
t^-1 = -1/15
-1 < 0
1/(t^1) = -1/15 // * t^1
1 = -1/15*t^1 // : -1/15
-15 = t^1
t = -15
t = -15
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